View Compilation Error

0_0_21532376_4019.cpp: In function 'int main()':
0_0_21532376_4019.cpp:88:13: error: 'ans' was not declared in this scope
             ans += nowh * ((getsum(tree, n) - getsum(tree, nowd)) - (getsum(num, n) - getsum(num, nowd)) * nowd);
             ^
0_0_21532376_4019.cpp:93:15: error: 'ans' was not declared in this scope
         cout<<ans<<endl;
               ^