image-hide-and-seek

Test case file format:

1. One line, containing one integer N, which is the number of images contained in the test case file
2. N times, the following format:
3. One line, containing the name of the image to be tested
4. One line, containing one integer M, which is the number of colors to be found for this image
5. M lines, each containing three space separated integers, which represent an RGB color.

Here's a sample showing how the algorithm works (Pixels are colored red as they are examined):