View Compilation Error

0_0_10824748_27966.cpp: In function `void BFS()':
0_0_10824748_27966.cpp:29: error: `s' undeclared (first use this function)
0_0_10824748_27966.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10824748_27966.cpp: In function `int main()':
0_0_10824748_27966.cpp:87: error: `mat' undeclared (first use this function)
0_0_10824748_27966.cpp:96: error: `s' undeclared (first use this function)
0_0_10824748_27966.cpp:96: error: `INF' undeclared (first use this function)