View Compilation Error

0_0_13976411_11237.cpp: In function 'int main()':
0_0_13976411_11237.cpp:170:7: error: 'ans' was not declared in this scope
       ans[Index++] = "NO";
       ^
0_0_13976411_11237.cpp:175:7: error: 'ans' was not declared in this scope
       ans[Index++] = "YES";
       ^