View Compilation Error

0_0_26449401_6771.cpp: In function 'int main()':
0_0_26449401_6771.cpp:67:5: error: 'ans' was not declared in this scope
     ans = min(d[(1<<cnt)-1][0], ans);
     ^
0_0_26449401_6771.cpp:68:10: error: 'ans' was not declared in this scope
    cout<<ans<<endl;
          ^