View Compilation Error

0_0_2700711_20334.cpp:11: error: size of array `a' is too large
0_0_2700711_20334.cpp: In function `bool Bfs()':
0_0_2700711_20334.cpp:40: error: `a' undeclared (first use this function)
0_0_2700711_20334.cpp:40: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2700711_20334.cpp: In function `int main()':
0_0_2700711_20334.cpp:90: error: `a' undeclared (first use this function)