View Compilation Error

0_0_4133577_13356.cpp: In function `int dinic_bfs()':
0_0_4133577_13356.cpp:40: error: `src' undeclared (first use this function)
0_0_4133577_13356.cpp:40: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4133577_13356.cpp:50: error: `dest' undeclared (first use this function)