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0_0_39574743_28617.cpp: In function 'bool bfs()':
0_0_39574743_28617.cpp:38:9: error: 'memset' was not declared in this scope
   38 |         memset(used, 0, sizeof(used));
      |         ^~~~~~
0_0_39574743_28617.cpp:4:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    3 | #include <algorithm>
  +++ |+#include <cstring>
    4 | using namespace std;
0_0_39574743_28617.cpp: In function 'int main()':
0_0_39574743_28617.cpp:84:17: error: 'memset' was not declared in this scope
   84 |                 memset(mp, false, sizeof(mp));
      |                 ^~~~~~
0_0_39574743_28617.cpp:84:17: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?