View Compilation Error

0_0_9296431_23971.cpp: In function `void bfs()':
0_0_9296431_23971.cpp:89: error: void value not ignored as it ought to be
0_0_9296431_23971.cpp:90: error: `x' undeclared (first use this function)
0_0_9296431_23971.cpp:90: error: (Each undeclared identifier is reported only once for each function it appears in.)