View Compilation Error

0_0_3198172_13877.cpp: In function `void bfs(int, int, int*)':
0_0_3198172_13877.cpp:25: error: `tot' undeclared (first use this function)
0_0_3198172_13877.cpp:25: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3198172_13877.cpp: At global scope:
0_0_3198172_13877.cpp:51: error: `int tot' used prior to declaration