foo.cc: In function 'int main()':
foo.cc:14:9: error: 'map' was not declared in this scope
   14 |         map[c][b]=1;
      |         ^~~
foo.cc:2:1: note: 'std::map' is defined in header '<map>'; did you forget to '#include <map>'?
    1 | #include<iostream>
  +++ |+#include <map>
    2 | using namespace std;

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