View Compilation Error

0_0_4076357_10280.cpp:15: error: expected init-declarator before numeric constant
0_0_4076357_10280.cpp:15: error: expected `,' or `;' before numeric constant
0_0_4076357_10280.cpp: In function `void bfs()':
0_0_4076357_10280.cpp:36: error: `used' undeclared (first use this function)
0_0_4076357_10280.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4076357_10280.cpp: In function `int main()':
0_0_4076357_10280.cpp:65: error: `used' undeclared (first use this function)