View Compilation Error

0_0_4133587_8470.cpp: In function `void Dinic()':
0_0_4133587_8470.cpp:54: error: `ans' undeclared (first use this function)
0_0_4133587_8470.cpp:54: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4133587_8470.cpp:60: error: `oo' undeclared (first use this function)
0_0_4133587_8470.cpp: In function `int main()':
0_0_4133587_8470.cpp:151: error: void value not ignored as it ought to be