View Compilation Error

0_0_10824744_13748.cpp: In function `void BFS()':
0_0_10824744_13748.cpp:29: error: `s' undeclared (first use this function)
0_0_10824744_13748.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10824744_13748.cpp: In function `int main()':
0_0_10824744_13748.cpp:87: error: `mat' undeclared (first use this function)
0_0_10824744_13748.cpp:92: error: `ex' undeclared (first use this function)
0_0_10824744_13748.cpp:93: error: `ey' undeclared (first use this function)
0_0_10824744_13748.cpp:94: error: `ez' undeclared (first use this function)
0_0_10824744_13748.cpp:96: error: `s' undeclared (first use this function)
0_0_10824744_13748.cpp:96: error: `INF' undeclared (first use this function)