0_0_25079437_26454.cpp: In function 'void init()':
0_0_25079437_26454.cpp:20:31: error: 'memset' was not declared in this scope
memset(head, -1, sizeof(head));
^
0_0_25079437_26454.cpp: In function 'bool bfs(int, int)':
0_0_25079437_26454.cpp:33:29: error: 'memset' was not declared in this scope
memset(pre, -1, sizeof(pre));
^
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