View Compilation Error

0_0_25579153_3454.cpp: In function 'int32_t main()':
0_0_25579153_3454.cpp:39:15: error: 'i' was not declared in this scope
           for(i=1;i<=n;i++)ans[i]=0;
               ^
0_0_25579153_3454.cpp:40:11: error: 'i' was not declared in this scope
       for(i=1;i<all;i++)add(ans[cnt[i]],f[i]);
           ^
0_0_25579153_3454.cpp:41:11: error: 'i' was not declared in this scope
       for(i=2;i<=n;i+=2)printf("%d%c",ans[i],i<n?' ':'\n');
           ^