View Compilation Error

0_0_6002766_17421.cpp: In function `int main()':
0_0_6002766_17421.cpp:36: error: `ans' undeclared (first use this function)
0_0_6002766_17421.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6002766_17421.cpp:43: error: expected `}' at end of input