View Compilation Error

0_0_12288365_20126.cpp: In function `bool check2(char*)':
0_0_12288365_20126.cpp:76: error: `bfs' undeclared (first use this function)
0_0_12288365_20126.cpp:76: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12288365_20126.cpp: In function `int bfs(int, int)':
0_0_12288365_20126.cpp:80: error: `int bfs(int, int)' used prior to declaration