Main.cc: In function 'int main()': Main.cc:55:2: error: 'it' was not declared in this scope it n,k; ^ Main.cc:56:7: error: 'n' was not declared in this scope cin>>n; ^ Main.cc:58:8: error: 'k' was not declared in this scope cin>>k; ^ Main.cc:63:8: error: 'k' was not declared in this scope if(a[k]>0){ ^