foo.cc: In function 'int main()':
foo.cc:89:9: error: 'memset' was not declared in this scope
   89 |         memset(mapp, 0, sizeof mapp);
      |         ^~~~~~
foo.cc:3:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    2 | #include <queue>
  +++ |+#include <cstring>
    3 | 

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