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0_0_39596833_21419.cpp: In function 'void BFS(int, int, int)':
0_0_39596833_21419.cpp:24:5: error: 'memset' was not declared in this scope
   24 |     memset(vis, 0, sizeof(vis));
      |     ^~~~~~
0_0_39596833_21419.cpp:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include <queue>
  +++ |+#include <cstring>
    3 | #include <string>