Description: Request image perimeter (ZOJ1047) to a use. And X, said the graphics, graphics, down, left, right, upper left, lower left, upper right, lower right eight directions are seen as connected, and the middle image does not appear empty, find the graphics side. Input: Firstly m, n, x, y four positive integer m × n are given below the graph, x, y position that hits all 0 end.
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图像的周长.cpp
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