View Compilation Error

0_0_13976409_24461.cpp: In function 'int main()':
0_0_13976409_24461.cpp:170:7: error: 'ans' was not declared in this scope
       ans[Index++] = "NO";
       ^
0_0_13976409_24461.cpp:175:7: error: 'ans' was not declared in this scope
       ans[Index++] = "YES";
       ^
0_0_13976409_24461.cpp:182:15: error: 'ans' was not declared in this scope
         cout<<ans[i]<<endl;
               ^