View Compilation Error

0_0_37874936_29909.cpp: In function 'int main()':
0_0_37874936_29909.cpp:98:30: error: 'ans' was not declared in this scope
         if (res == must_win) ans = 1;
                              ^
0_0_37874936_29909.cpp:99:14: error: 'ans' was not declared in this scope
         else ans = 0;
              ^
0_0_37874936_29909.cpp:100:13: error: 'ans' was not declared in this scope
         if (ans) {
             ^