View Compilation Error

0_0_19656371_12778.cpp: In function 'int main()':
0_0_19656371_12778.cpp:91:5: error: no match for 'operator[]' (operand types are 'int' and 'std::string {aka std::basic_string<char>}')
    m[a]=i;
     ^
0_0_19656371_12778.cpp:114:13: error: no match for 'operator[]' (operand types are 'int' and 'std::string {aka std::basic_string<char>}')
     int kk=m[b];
             ^