View Compilation Error

0_0_38756976_11980.cpp: In function 'int QYB::main()':
0_0_38756976_11980.cpp:50:21: error: 'ans' was not declared in this scope; did you mean 'abs'?
   50 |         while (tmp) ans += tmp, tmp = dinic(2 * n + 1, 1000000000);
      |                     ^~~
      |                     abs