View Compilation Error

0_0_18939449_1188.cpp: In function 'int main()':
0_0_18939449_1188.cpp:158:7: error: redeclaration of 'int ans'
   int ans = 0;
       ^
0_0_18939449_1188.cpp:142:7: note: 'int ans' previously declared here
   int ans = 0;
       ^