View Compilation Error

0_0_8224190_31907.c:3:17: queue: No such file or directory
0_0_8224190_31907.c:6: error: syntax error before "namespace"
0_0_8224190_31907.c:15: error: syntax error before "friend"
0_0_8224190_31907.c: In function `bfs':
0_0_8224190_31907.c:29: error: `priority_queue' undeclared (first use in this function)
0_0_8224190_31907.c:29: error: (Each undeclared identifier is reported only once
0_0_8224190_31907.c:29: error: for each function it appears in.)
0_0_8224190_31907.c:29: error: `comp' undeclared (first use in this function)
0_0_8224190_31907.c:29: error: `q' undeclared (first use in this function)
0_0_8224190_31907.c:30: error: syntax error before "cur"
0_0_8224190_31907.c:33: error: `cur' undeclared (first use in this function)
0_0_8224190_31907.c:47: error: `next' undeclared (first use in this function)