View Compilation Error

0_0_28354498_18742.cpp: In function 'int main()':
0_0_28354498_18742.cpp:14:9: error: 'ans' was not declared in this scope
         ans=0;
         ^
0_0_28354498_18742.cpp:15:23: error: 'n' was not declared in this scope
         scanf("%d%d",&n,&m);
                       ^
0_0_28354498_18742.cpp:15:26: error: 'm' was not declared in this scope
         scanf("%d%d",&n,&m);
                          ^
0_0_28354498_18742.cpp:26:15: error: 'i' was not declared in this scope
             f[i][0]=f[i][m+1]=-1;
               ^