262. Symbol Recognition time limit per test: 0.25 sec. memory limit per test: 65536 KB input: standard output: standard Consider a monochrome computer monitor with N x M pixels resolution. It can display K symbols. Symbol is a non-empty set of black pixels on the screen. You are to write a program, that computes minimal possible amount of pixels, that are enough to recognize a symbol. Input First line of input contains integers N, M, K (1 <= N, M <= 10, 2 <= K <= 6). K blocks follow, separated by empty lines. Each block consists of N rows of M characters. It s a symbols representation on the N x M screen. `1 denotes black pixel, `0 denotes white pixel. You may assume that symbols are unique. Output Print on the first line of output the minimal possible amount of pixels that enough to recognize symbol. I.e. you have to find set of pixels that has different color in each pair of symbols. If there are several sets with equal amount of pixels, output any

sgu262.cpp

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