View Compilation Error

0_0_29836625_14274.cpp: In function 'int main()':
0_0_29836625_14274.cpp:19:11: error: conflicting declaration 'std::string n'
    string n;
           ^
0_0_29836625_14274.cpp:18:8: note: previous declaration as 'int n'
    int n, m;
        ^