View Compilation Error

0_0_38754726_21640.cpp: In function 'int main()':
0_0_38754726_21640.cpp:74:40: error: use of an operand of type 'bool' in 'operator++' is forbidden in C++17
   74 |                                 mp[a][b]++;
      |                                 ~~~~~~~^
0_0_38754726_21640.cpp:75:40: error: use of an operand of type 'bool' in 'operator++' is forbidden in C++17
   75 |                                 mp[b][a]++;
      |                                 ~~~~~~~^