View Compilation Error

0_0_36386676_17451.cpp: In function 'void solve()':
0_0_36386676_17451.cpp:66:15: error: 'ans' was not declared in this scope
               ans=;
               ^
0_0_36386676_17451.cpp:66:19: error: expected primary-expression before ';' token
               ans=;
                   ^