View Compilation Error

0_0_35433952_18689.cpp: In function 'int main()':
0_0_35433952_18689.cpp:12:7: error: 'i' was not declared in this scope
   for(i = 0; i < n;i++){
       ^
0_0_35433952_18689.cpp:20:8: error: 'i' was not declared in this scope
   for( i = 0; i < m; i++){
        ^