0_0_13242389_21005.cpp: In function 'int main()':
0_0_13242389_21005.cpp:96:27: error: 'N' was not declared in this scope
while(scanf("%d %d", &N, &M) != EOF)
^
0_0_13242389_21005.cpp:96:31: error: 'M' was not declared in this scope
while(scanf("%d %d", &N, &M) != EOF)
^
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