0_0_27710141_23773.cpp: In function 'bool bfs(int, int)':
0_0_27710141_23773.cpp:16:29: error: 'memset' was not declared in this scope
memset(pre, -1, sizeof(pre));
^
0_0_27710141_23773.cpp: In function 'int main()':
0_0_27710141_23773.cpp:63:24: error: 'memset' was not declared in this scope
memset(r, 0, sizeof(r));
^
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