Initial Query

Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.

LLM Generation

Query

Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.

Output

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import sys

# GIF dimensions
WIDTH = 200
HEIGHT = 200

# Create a canvas (0 = white, 1 = red)
pixels = bytearray([0] * (WIDTH * HEIGHT))

# Define the triangle vertices
p1 = (WIDTH // 2, HEIGHT // 4)  # Top
p2 = (WIDTH // 4, 3 * HEIGHT // 4)  # Bottom left
p3 = (3 * WIDTH // 4, 3 * HEIGHT // 4)  # Bottom right

# Function to check if a point is inside the triangle
def is_inside_triangle(p, v1, v2, v3):
    def sign(p1, p2, p3):
        return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1])
    
    d1 = sign(p, v1, v2)
    d2 = sign(p, v2, v3)
    d3 = sign(p, v3, v1)
    
    has_neg = (d1 < 0) or (d2 < 0) or (d3 < 0)
    has_pos = (d1 > 0) or (d2 > 0) or (d3 > 0)
    
    return not (has_neg and has_pos)

# Fill the triangle with red (color index 1)
for y in range(HEIGHT):
    for x in range(WIDTH):
        if is_inside_triangle((x, y), p1, p2, p3):
            pixels[y * WIDTH + x] = 1

# LZW encode function for GIF
def lzw_encode(pixel_data, min_code_size):
    clear_code = 1 << min_code_size
    end_code = clear_code + 1
    
    # Initialize dictionary with single-pixel values
    dict_size = clear_code + 2
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output buffer
    output = bytearray()
    
    # Current code size in bits
    code_size = min_code_size + 1
    
    # Current code buffer and bit position
    code_buffer = 0
    code_buffer_size = 0
    
    # Output a code to the buffer
    def output_code(code):
        nonlocal code_buffer, code_buffer_size, output
        
        # Add code to buffer
        code_buffer |= (code << code_buffer_size)
        code_buffer_size += code_size
        
        # Output complete bytes
        while code_buffer_size >= 8:
            output.append(code_buffer & 0xFF)
            code_buffer >>= 8
            code_buffer_size -= 8
        
        # If dictionary size increases, increase code size too
        if dict_size == (1 << code_size) and code_size < 12:
            nonlocal code_size
            code_size += 1
    
    # Start with the clear code
    output_code(clear_code)
    
    # Process pixels
    current_sequence = ()
    for pixel in pixel_data:
        pixel_tuple = (pixel,)
        extended_sequence = current_sequence + pixel_tuple
        
        if extended_sequence in dictionary:
            current_sequence = extended_sequence
        else:
            # Output code for current sequence
            output_code(dictionary[current_sequence])
            
            # Add new sequence to dictionary if not full
            if dict_size < 4096:
                dictionary[extended_sequence] = dict_size
                dict_size += 1
            
            current_sequence = pixel_tuple
    
    # Output code for the last sequence
    if current_sequence:
        output_code(dictionary[current_sequence])
    
    # End with the end code
    output_code(end_code)
    
    # Flush any remaining bits
    if code_buffer_size > 0:
        output.append(code_buffer & 0xFF)
    
    # Break output into sub-blocks
    block_size = 255
    blocks = []
    for i in range(0, len(output), block_size):
        block = output[i:i+block_size]
        blocks.append(bytes([len(block)]) + block)
    
    return b''.join(blocks)

# Write GIF to stdout
output = sys.stdout.buffer

# GIF Header
output.write(b'GIF89a')

# Logical Screen Descriptor
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0x71, 0, 0]))  # GCT follows, 2 colors

# Global Color Table
output.write(bytes([255, 255, 255]))  # White
output.write(bytes([255, 0, 0]))      # Red

# Image Descriptor
output.write(bytes([0x2C]))  # Image Separator
output.write(bytes([0, 0]))  # Left position
output.write(bytes([0, 0]))  # Top position
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0]))  # No local color table

# Image Data - LZW minimum code size
min_code_size = 2  # We have 2 colors, so min code size is 2
output.write(bytes([min_code_size]))

# Encode and write the pixel data
encoded_data = lzw_encode(pixels, min_code_size)
output.write(encoded_data)

# End of image data
output.write(bytes([0]))

# GIF Trailer
output.write(bytes([0x3B]))
This program creates a 200x200 GIF with a white background and a red triangle. The triangle is defined by three points and then filled in pixel by pixel. The program implements LZW compression as required by the GIF format. To use this program, save it and run: 
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python your_soln.py > /tmp/a.gif
Then view the resulting GIF file at /tmp/a.gif.

Extract Code

I extracted the following code from that output: 

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import sys

# GIF dimensions
WIDTH = 200
HEIGHT = 200

# Create a canvas (0 = white, 1 = red)
pixels = bytearray([0] * (WIDTH * HEIGHT))

# Define the triangle vertices
p1 = (WIDTH // 2, HEIGHT // 4)  # Top
p2 = (WIDTH // 4, 3 * HEIGHT // 4)  # Bottom left
p3 = (3 * WIDTH // 4, 3 * HEIGHT // 4)  # Bottom right

# Function to check if a point is inside the triangle
def is_inside_triangle(p, v1, v2, v3):
    def sign(p1, p2, p3):
        return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1])
    
    d1 = sign(p, v1, v2)
    d2 = sign(p, v2, v3)
    d3 = sign(p, v3, v1)
    
    has_neg = (d1 < 0) or (d2 < 0) or (d3 < 0)
    has_pos = (d1 > 0) or (d2 > 0) or (d3 > 0)
    
    return not (has_neg and has_pos)

# Fill the triangle with red (color index 1)
for y in range(HEIGHT):
    for x in range(WIDTH):
        if is_inside_triangle((x, y), p1, p2, p3):
            pixels[y * WIDTH + x] = 1

# LZW encode function for GIF
def lzw_encode(pixel_data, min_code_size):
    clear_code = 1 << min_code_size
    end_code = clear_code + 1
    
    # Initialize dictionary with single-pixel values
    dict_size = clear_code + 2
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output buffer
    output = bytearray()
    
    # Current code size in bits
    code_size = min_code_size + 1
    
    # Current code buffer and bit position
    code_buffer = 0
    code_buffer_size = 0
    
    # Output a code to the buffer
    def output_code(code):
        nonlocal code_buffer, code_buffer_size, output
        
        # Add code to buffer
        code_buffer |= (code << code_buffer_size)
        code_buffer_size += code_size
        
        # Output complete bytes
        while code_buffer_size >= 8:
            output.append(code_buffer & 0xFF)
            code_buffer >>= 8
            code_buffer_size -= 8
        
        # If dictionary size increases, increase code size too
        if dict_size == (1 << code_size) and code_size < 12:
            nonlocal code_size
            code_size += 1
    
    # Start with the clear code
    output_code(clear_code)
    
    # Process pixels
    current_sequence = ()
    for pixel in pixel_data:
        pixel_tuple = (pixel,)
        extended_sequence = current_sequence + pixel_tuple
        
        if extended_sequence in dictionary:
            current_sequence = extended_sequence
        else:
            # Output code for current sequence
            output_code(dictionary[current_sequence])
            
            # Add new sequence to dictionary if not full
            if dict_size < 4096:
                dictionary[extended_sequence] = dict_size
                dict_size += 1
            
            current_sequence = pixel_tuple
    
    # Output code for the last sequence
    if current_sequence:
        output_code(dictionary[current_sequence])
    
    # End with the end code
    output_code(end_code)
    
    # Flush any remaining bits
    if code_buffer_size > 0:
        output.append(code_buffer & 0xFF)
    
    # Break output into sub-blocks
    block_size = 255
    blocks = []
    for i in range(0, len(output), block_size):
        block = output[i:i+block_size]
        blocks.append(bytes([len(block)]) + block)
    
    return b''.join(blocks)

# Write GIF to stdout
output = sys.stdout.buffer

# GIF Header
output.write(b'GIF89a')

# Logical Screen Descriptor
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0x71, 0, 0]))  # GCT follows, 2 colors

# Global Color Table
output.write(bytes([255, 255, 255]))  # White
output.write(bytes([255, 0, 0]))      # Red

# Image Descriptor
output.write(bytes([0x2C]))  # Image Separator
output.write(bytes([0, 0]))  # Left position
output.write(bytes([0, 0]))  # Top position
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0]))  # No local color table

# Image Data - LZW minimum code size
min_code_size = 2  # We have 2 colors, so min code size is 2
output.write(bytes([min_code_size]))

# Encode and write the pixel data
encoded_data = lzw_encode(pixels, min_code_size)
output.write(encoded_data)

# End of image data
output.write(bytes([0]))

# GIF Trailer
output.write(bytes([0x3B]))

Run Code Interpreter

Running the following program: 

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import sys

# GIF dimensions
WIDTH = 200
HEIGHT = 200

# Create a canvas (0 = white, 1 = red)
pixels = bytearray([0] * (WIDTH * HEIGHT))

# Define the triangle vertices
p1 = (WIDTH // 2, HEIGHT // 4)  # Top
p2 = (WIDTH // 4, 3 * HEIGHT // 4)  # Bottom left
p3 = (3 * WIDTH // 4, 3 * HEIGHT // 4)  # Bottom right

# Function to check if a point is inside the triangle
def is_inside_triangle(p, v1, v2, v3):
    def sign(p1, p2, p3):
        return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1])
    
    d1 = sign(p, v1, v2)
    d2 = sign(p, v2, v3)
    d3 = sign(p, v3, v1)
    
    has_neg = (d1 < 0) or (d2 < 0) or (d3 < 0)
    has_pos = (d1 > 0) or (d2 > 0) or (d3 > 0)
    
    return not (has_neg and has_pos)

# Fill the triangle with red (color index 1)
for y in range(HEIGHT):
    for x in range(WIDTH):
        if is_inside_triangle((x, y), p1, p2, p3):
            pixels[y * WIDTH + x] = 1

# LZW encode function for GIF
def lzw_encode(pixel_data, min_code_size):
    clear_code = 1 << min_code_size
    end_code = clear_code + 1
    
    # Initialize dictionary with single-pixel values
    dict_size = clear_code + 2
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output buffer
    output = bytearray()
    
    # Current code size in bits
    code_size = min_code_size + 1
    
    # Current code buffer and bit position
    code_buffer = 0
    code_buffer_size = 0
    
    # Output a code to the buffer
    def output_code(code):
        nonlocal code_buffer, code_buffer_size, output
        
        # Add code to buffer
        code_buffer |= (code << code_buffer_size)
        code_buffer_size += code_size
        
        # Output complete bytes
        while code_buffer_size >= 8:
            output.append(code_buffer & 0xFF)
            code_buffer >>= 8
            code_buffer_size -= 8
        
        # If dictionary size increases, increase code size too
        if dict_size == (1 << code_size) and code_size < 12:
            nonlocal code_size
            code_size += 1
    
    # Start with the clear code
    output_code(clear_code)
    
    # Process pixels
    current_sequence = ()
    for pixel in pixel_data:
        pixel_tuple = (pixel,)
        extended_sequence = current_sequence + pixel_tuple
        
        if extended_sequence in dictionary:
            current_sequence = extended_sequence
        else:
            # Output code for current sequence
            output_code(dictionary[current_sequence])
            
            # Add new sequence to dictionary if not full
            if dict_size < 4096:
                dictionary[extended_sequence] = dict_size
                dict_size += 1
            
            current_sequence = pixel_tuple
    
    # Output code for the last sequence
    if current_sequence:
        output_code(dictionary[current_sequence])
    
    # End with the end code
    output_code(end_code)
    
    # Flush any remaining bits
    if code_buffer_size > 0:
        output.append(code_buffer & 0xFF)
    
    # Break output into sub-blocks
    block_size = 255
    blocks = []
    for i in range(0, len(output), block_size):
        block = output[i:i+block_size]
        blocks.append(bytes([len(block)]) + block)
    
    return b''.join(blocks)

# Write GIF to stdout
output = sys.stdout.buffer

# GIF Header
output.write(b'GIF89a')

# Logical Screen Descriptor
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0x71, 0, 0]))  # GCT follows, 2 colors

# Global Color Table
output.write(bytes([255, 255, 255]))  # White
output.write(bytes([255, 0, 0]))      # Red

# Image Descriptor
output.write(bytes([0x2C]))  # Image Separator
output.write(bytes([0, 0]))  # Left position
output.write(bytes([0, 0]))  # Top position
output.write(WIDTH.to_bytes(2, byteorder='little'))
output.write(HEIGHT.to_bytes(2, byteorder='little'))
output.write(bytes([0]))  # No local color table

# Image Data - LZW minimum code size
min_code_size = 2  # We have 2 colors, so min code size is 2
output.write(bytes([min_code_size]))

# Encode and write the pixel data
encoded_data = lzw_encode(pixels, min_code_size)
output.write(encoded_data)

# End of image data
output.write(bytes([0]))

# GIF Trailer
output.write(bytes([0x3B]))
And got the output: b' File "/usr/src/app/main.py", line 71\n nonlocal code_size\n ^^^^^^^^^^^^^^^^^^\nSyntaxError: name \'code_size\' is used prior to nonlocal declaration\n'

LLM Generation

Query

Describe the shapes in this image and their color

Output

cannot identify image file <_io.BytesIO object at 0x7fd84778ac70>

Check if all of the following conditions are true:

Substring Evaluation

Testing if the previous output contains the string red: False

Substring Evaluation

Testing if the previous output contains the string triangle: False

Final Answer: False

Initial Query

Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.

LLM Generation

Query

Write a python program that, manually, draws a red triangle on a white background and saves it as a 200x200 gif file. Do not use any graphics libraries. Write the gif byte by byte. Output the gif file to stdout. I will evaluate your program by running `python your_soln.py > /tmp/a.gif` and then view the output file.

Output

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import sys

def write_gif_to_stdout():
    # Image dimensions
    width, height = 200, 200
    
    # Define colors
    white_index = 0
    red_index = 1
    
    # Create image data (0 = white, 1 = red)
    pixels = []
    for y in range(height):
        for x in range(width):
            # Define triangle vertices
            x1, y1 = 100, 50     # Top point
            x2, y2 = 50, 150     # Bottom left
            x3, y3 = 150, 150    # Bottom right
            
            # Check if point is in triangle
            if is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
                pixels.append(red_index)
            else:
                pixels.append(white_index)
    
    # GIF Header
    sys.stdout.buffer.write(b'GIF89a')
    
    # Logical Screen Descriptor
    sys.stdout.buffer.write(bytes([
        width & 0xFF, (width >> 8) & 0xFF,  # Width (LSB first)
        height & 0xFF, (height >> 8) & 0xFF,  # Height (LSB first)
        0x91,  # 1001 0001 - Global Color Table, 2 bits/pixel, 2^(2+1)=8 colors
        white_index,  # Background color is white
        0  # Default pixel aspect ratio
    ]))
    
    # Global Color Table (8 colors but we only use white and red)
    sys.stdout.buffer.write(bytes([
        255, 255, 255,  # White (index 0)
        255, 0, 0,      # Red (index 1)
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0         # Unused color
    ]))
    
    # Image Descriptor
    sys.stdout.buffer.write(bytes([
        0x2C,  # Image separator
        0, 0,  # Left position
        0, 0,  # Top position
        width & 0xFF, (width >> 8) & 0xFF,  # Width
        height & 0xFF, (height >> 8) & 0xFF,  # Height
        0  # No local color table
    ]))
    
    # Image Data
    min_code_size = 2  # 2 bits for 2 colors (min code size must be at least 2)
    sys.stdout.buffer.write(bytes([min_code_size]))
    
    # LZW encode the pixel data
    compressed = lzw_compress(pixels, min_code_size)
    
    # Write compressed data in blocks
    for i in range(0, len(compressed), 255):
        block = compressed[i:i+255]
        sys.stdout.buffer.write(bytes([len(block)]))
        sys.stdout.buffer.write(block)
    
    # End of image data
    sys.stdout.buffer.write(bytes([0]))
    
    # GIF Trailer
    sys.stdout.buffer.write(bytes([0x3B]))

def is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
    # Calculate barycentric coordinates
    d = (y2 - y3) * (x1 - x3) + (x3 - x2) * (y1 - y3)
    if d == 0:
        return False
    
    a = ((y2 - y3) * (x - x3) + (x3 - x2) * (y - y3)) / d
    b = ((y3 - y1) * (x - x3) + (x1 - x3) * (y - y3)) / d
    c = 1 - a - b
    
    # Check if point is inside triangle
    return 0 <= a <= 1 and 0 <= b <= 1 and 0 <= c <= 1

def lzw_compress(pixels, min_code_size):
    """LZW compress pixel data for GIF"""
    clear_code = 1 << min_code_size
    eoi_code = clear_code + 1
    next_code = eoi_code + 1
    
    # Initialize dictionary with basic codes
    dict_size = next_code
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output stream
    output = bytearray()
    bit_buffer = 0
    bit_count = 0
    code_size = min_code_size + 1
    
    # Start with clear code
    put_code(output, clear_code, code_size, bit_buffer, bit_count)
    bit_buffer = 0
    bit_count = 0
    
    current = ()
    for pixel in pixels:
        next_pixel = current + (pixel,)
        if next_pixel in dictionary:
            current = next_pixel
        else:
            # Output code for current sequence
            put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
            bit_buffer = 0
            bit_count = 0
            
            # Add new sequence to dictionary if there's still room
            if dict_size < 4096:  # GIF max code is 12 bits (0-4095)
                dictionary[next_pixel] = dict_size
                dict_size += 1
                
                # Increase code size if needed
                if dict_size >= (1 << code_size) and code_size < 12:
                    code_size += 1
            
            current = (pixel,)
    
    # Output code for the last sequence
    if current:
        put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
        bit_buffer = 0
        bit_count = 0
    
    # End with EOI code
    put_code(output, eoi_code, code_size, bit_buffer, bit_count)
    
    # Flush any remaining bits
    if bit_count > 0:
        output.append(bit_buffer)
    
    return output

def put_code(output, code, code_size, bit_buffer, bit_count):
    # Add code to the byte buffer
    bit_buffer |= (code << bit_count)
    bit_count += code_size
    
    # Output full bytes
    while bit_count >= 8:
        output.append(bit_buffer & 0xFF)
        bit_buffer >>= 8
        bit_count -= 8

if __name__ == "__main__":
    write_gif_to_stdout()
This program draws a red triangle on a white background, creating a GIF file from scratch. Here's what it does: 1. Defines a 200x200 pixel image 2. Uses barycentric coordinates to determine if each pixel is inside the triangle 3. Creates the GIF header, screen descriptor, and color table 4. Implements LZW compression for the pixel data 5. Writes the image block by block 6. Adds the GIF trailer When run with `python your_soln.py > /tmp/a.gif`, it will create a valid GIF file showing a red triangle on a white background.

Extract Code

I extracted the following code from that output: 

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import sys

def write_gif_to_stdout():
    # Image dimensions
    width, height = 200, 200
    
    # Define colors
    white_index = 0
    red_index = 1
    
    # Create image data (0 = white, 1 = red)
    pixels = []
    for y in range(height):
        for x in range(width):
            # Define triangle vertices
            x1, y1 = 100, 50     # Top point
            x2, y2 = 50, 150     # Bottom left
            x3, y3 = 150, 150    # Bottom right
            
            # Check if point is in triangle
            if is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
                pixels.append(red_index)
            else:
                pixels.append(white_index)
    
    # GIF Header
    sys.stdout.buffer.write(b'GIF89a')
    
    # Logical Screen Descriptor
    sys.stdout.buffer.write(bytes([
        width & 0xFF, (width >> 8) & 0xFF,  # Width (LSB first)
        height & 0xFF, (height >> 8) & 0xFF,  # Height (LSB first)
        0x91,  # 1001 0001 - Global Color Table, 2 bits/pixel, 2^(2+1)=8 colors
        white_index,  # Background color is white
        0  # Default pixel aspect ratio
    ]))
    
    # Global Color Table (8 colors but we only use white and red)
    sys.stdout.buffer.write(bytes([
        255, 255, 255,  # White (index 0)
        255, 0, 0,      # Red (index 1)
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0         # Unused color
    ]))
    
    # Image Descriptor
    sys.stdout.buffer.write(bytes([
        0x2C,  # Image separator
        0, 0,  # Left position
        0, 0,  # Top position
        width & 0xFF, (width >> 8) & 0xFF,  # Width
        height & 0xFF, (height >> 8) & 0xFF,  # Height
        0  # No local color table
    ]))
    
    # Image Data
    min_code_size = 2  # 2 bits for 2 colors (min code size must be at least 2)
    sys.stdout.buffer.write(bytes([min_code_size]))
    
    # LZW encode the pixel data
    compressed = lzw_compress(pixels, min_code_size)
    
    # Write compressed data in blocks
    for i in range(0, len(compressed), 255):
        block = compressed[i:i+255]
        sys.stdout.buffer.write(bytes([len(block)]))
        sys.stdout.buffer.write(block)
    
    # End of image data
    sys.stdout.buffer.write(bytes([0]))
    
    # GIF Trailer
    sys.stdout.buffer.write(bytes([0x3B]))

def is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
    # Calculate barycentric coordinates
    d = (y2 - y3) * (x1 - x3) + (x3 - x2) * (y1 - y3)
    if d == 0:
        return False
    
    a = ((y2 - y3) * (x - x3) + (x3 - x2) * (y - y3)) / d
    b = ((y3 - y1) * (x - x3) + (x1 - x3) * (y - y3)) / d
    c = 1 - a - b
    
    # Check if point is inside triangle
    return 0 <= a <= 1 and 0 <= b <= 1 and 0 <= c <= 1

def lzw_compress(pixels, min_code_size):
    """LZW compress pixel data for GIF"""
    clear_code = 1 << min_code_size
    eoi_code = clear_code + 1
    next_code = eoi_code + 1
    
    # Initialize dictionary with basic codes
    dict_size = next_code
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output stream
    output = bytearray()
    bit_buffer = 0
    bit_count = 0
    code_size = min_code_size + 1
    
    # Start with clear code
    put_code(output, clear_code, code_size, bit_buffer, bit_count)
    bit_buffer = 0
    bit_count = 0
    
    current = ()
    for pixel in pixels:
        next_pixel = current + (pixel,)
        if next_pixel in dictionary:
            current = next_pixel
        else:
            # Output code for current sequence
            put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
            bit_buffer = 0
            bit_count = 0
            
            # Add new sequence to dictionary if there's still room
            if dict_size < 4096:  # GIF max code is 12 bits (0-4095)
                dictionary[next_pixel] = dict_size
                dict_size += 1
                
                # Increase code size if needed
                if dict_size >= (1 << code_size) and code_size < 12:
                    code_size += 1
            
            current = (pixel,)
    
    # Output code for the last sequence
    if current:
        put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
        bit_buffer = 0
        bit_count = 0
    
    # End with EOI code
    put_code(output, eoi_code, code_size, bit_buffer, bit_count)
    
    # Flush any remaining bits
    if bit_count > 0:
        output.append(bit_buffer)
    
    return output

def put_code(output, code, code_size, bit_buffer, bit_count):
    # Add code to the byte buffer
    bit_buffer |= (code << bit_count)
    bit_count += code_size
    
    # Output full bytes
    while bit_count >= 8:
        output.append(bit_buffer & 0xFF)
        bit_buffer >>= 8
        bit_count -= 8

if __name__ == "__main__":
    write_gif_to_stdout()

Run Code Interpreter

Running the following program: 

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import sys

def write_gif_to_stdout():
    # Image dimensions
    width, height = 200, 200
    
    # Define colors
    white_index = 0
    red_index = 1
    
    # Create image data (0 = white, 1 = red)
    pixels = []
    for y in range(height):
        for x in range(width):
            # Define triangle vertices
            x1, y1 = 100, 50     # Top point
            x2, y2 = 50, 150     # Bottom left
            x3, y3 = 150, 150    # Bottom right
            
            # Check if point is in triangle
            if is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
                pixels.append(red_index)
            else:
                pixels.append(white_index)
    
    # GIF Header
    sys.stdout.buffer.write(b'GIF89a')
    
    # Logical Screen Descriptor
    sys.stdout.buffer.write(bytes([
        width & 0xFF, (width >> 8) & 0xFF,  # Width (LSB first)
        height & 0xFF, (height >> 8) & 0xFF,  # Height (LSB first)
        0x91,  # 1001 0001 - Global Color Table, 2 bits/pixel, 2^(2+1)=8 colors
        white_index,  # Background color is white
        0  # Default pixel aspect ratio
    ]))
    
    # Global Color Table (8 colors but we only use white and red)
    sys.stdout.buffer.write(bytes([
        255, 255, 255,  # White (index 0)
        255, 0, 0,      # Red (index 1)
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0,        # Unused color
        0, 0, 0         # Unused color
    ]))
    
    # Image Descriptor
    sys.stdout.buffer.write(bytes([
        0x2C,  # Image separator
        0, 0,  # Left position
        0, 0,  # Top position
        width & 0xFF, (width >> 8) & 0xFF,  # Width
        height & 0xFF, (height >> 8) & 0xFF,  # Height
        0  # No local color table
    ]))
    
    # Image Data
    min_code_size = 2  # 2 bits for 2 colors (min code size must be at least 2)
    sys.stdout.buffer.write(bytes([min_code_size]))
    
    # LZW encode the pixel data
    compressed = lzw_compress(pixels, min_code_size)
    
    # Write compressed data in blocks
    for i in range(0, len(compressed), 255):
        block = compressed[i:i+255]
        sys.stdout.buffer.write(bytes([len(block)]))
        sys.stdout.buffer.write(block)
    
    # End of image data
    sys.stdout.buffer.write(bytes([0]))
    
    # GIF Trailer
    sys.stdout.buffer.write(bytes([0x3B]))

def is_point_in_triangle(x, y, x1, y1, x2, y2, x3, y3):
    # Calculate barycentric coordinates
    d = (y2 - y3) * (x1 - x3) + (x3 - x2) * (y1 - y3)
    if d == 0:
        return False
    
    a = ((y2 - y3) * (x - x3) + (x3 - x2) * (y - y3)) / d
    b = ((y3 - y1) * (x - x3) + (x1 - x3) * (y - y3)) / d
    c = 1 - a - b
    
    # Check if point is inside triangle
    return 0 <= a <= 1 and 0 <= b <= 1 and 0 <= c <= 1

def lzw_compress(pixels, min_code_size):
    """LZW compress pixel data for GIF"""
    clear_code = 1 << min_code_size
    eoi_code = clear_code + 1
    next_code = eoi_code + 1
    
    # Initialize dictionary with basic codes
    dict_size = next_code
    dictionary = {(i,): i for i in range(clear_code)}
    
    # Output stream
    output = bytearray()
    bit_buffer = 0
    bit_count = 0
    code_size = min_code_size + 1
    
    # Start with clear code
    put_code(output, clear_code, code_size, bit_buffer, bit_count)
    bit_buffer = 0
    bit_count = 0
    
    current = ()
    for pixel in pixels:
        next_pixel = current + (pixel,)
        if next_pixel in dictionary:
            current = next_pixel
        else:
            # Output code for current sequence
            put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
            bit_buffer = 0
            bit_count = 0
            
            # Add new sequence to dictionary if there's still room
            if dict_size < 4096:  # GIF max code is 12 bits (0-4095)
                dictionary[next_pixel] = dict_size
                dict_size += 1
                
                # Increase code size if needed
                if dict_size >= (1 << code_size) and code_size < 12:
                    code_size += 1
            
            current = (pixel,)
    
    # Output code for the last sequence
    if current:
        put_code(output, dictionary[current], code_size, bit_buffer, bit_count)
        bit_buffer = 0
        bit_count = 0
    
    # End with EOI code
    put_code(output, eoi_code, code_size, bit_buffer, bit_count)
    
    # Flush any remaining bits
    if bit_count > 0:
        output.append(bit_buffer)
    
    return output

def put_code(output, code, code_size, bit_buffer, bit_count):
    # Add code to the byte buffer
    bit_buffer |= (code << bit_count)
    bit_count += code_size
    
    # Output full bytes
    while bit_count >= 8:
        output.append(bit_buffer & 0xFF)
        bit_buffer >>= 8
        bit_count -= 8

if __name__ == "__main__":
    write_gif_to_stdout()
And got the output: b'GIF89a\xc8\x00\xc8\x00\x91\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,\x00\x00\x00\x00\xc8\x00\xc8\x00\x00\x02\xff\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91]\x01\x92=\x94\x95:\x01\x9a\x989\x9a\x97\x9c5\x9e\x9b\xa04\xa2\x9f\xa40\xa6\xa3\xa8/\xaa\xa7\xac,\xae\xaf\xb0(\xb2\xb3\xb4&\xb6\xb7\xb8"\xba\xbb\xbc\x1f\xbe\xab\xc0\xbd\xc2\xc4#\xc2\x9e\xc7!\xc9\xc3\xcb\x1b\xcd\xca\xcf\x1c\xd1\xce\xd3\x16\xd5\xd2\xd7\x17\xd9\xd6\xdb\x12\xdd\xde\xdf\x0e\xe1\xe2\xe3\x0c\xe5\xe6\xe7\x08\xe9\xea\xeb\x00\xed\xda\xef\n\xf1\xee\xe3\xf5\xf2\xf3\x06\xf8\xf6\xd7\xfc\xf9\xef\xff\xfd\xcb\x02\x00\xf7\x05\xbf\xfe\x08\t\x04\x0b\x0c\xc7\x0e\x03\xb4\x11\x12\xac\x14\x06\x10\x17\x0f\xb0\x1a\x18\xbc\x1d\x15\x98 \x1e\x1c#\x1b\x9c&$\xa4)!\x90,-\x8d/0\x8c23\x8956\x878*.;\'4>9\x83AB\x81D<\x8bGE~JH\x88MK{PN\x85SQxVT\x82YWu\\Z\x7f_]rb`|ecohfykimnojqritufwxdzl\x8ed}?^\x80{`\x83\x84^\x86~p\x89\x81p\x8c\x8as\x8f\x8d\x8b\x92\x93k\x95\x87W\x98\x90e\x9b\x99T\x9e\x9cb\xa1\x9fQ\xa4\xa2_\xa7\xa5N\xaa\xa8\\\xad\xabK\xb0\xaeY\xb3\xb1H\xb6\xb4V\xb9\xb7E\xbc\xbaS\xbf\xbdB\xc2\xc0P\xc5\xc3?\xc8\xc6M\xcb\xc9<\xce\xccJ\xd1\xcf\x9d\xd4\xd5\xfa\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\xe0\x05\x00;'

LLM Generation

Query

Describe the shapes in this image and their color

Output

broken data stream when reading image file

Check if all of the following conditions are true:

Substring Evaluation

Testing if the previous output contains the string red: False

Substring Evaluation

Testing if the previous output contains the string triangle: False

Final Answer: False