View Compilation Error

0_0_9140420_5932.cpp:5: error: size of array `a' is too large
0_0_9140420_5932.cpp: In function `void bfs(int)':
0_0_9140420_5932.cpp:16: error: `a' undeclared (first use this function)
0_0_9140420_5932.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9140420_5932.cpp: In function `int main()':
0_0_9140420_5932.cpp:37: error: `a' undeclared (first use this function)