View Compilation Error

0_0_36924759_5699.cpp: In function 'void init()':
0_0_36924759_5699.cpp:17:32: error: 'memset' was not declared in this scope
     memset(head,-1,sizeof(head));
                                ^
0_0_36924759_5699.cpp: In function 'bool bfs()':
0_0_36924759_5699.cpp:50:5: error: 'queue' was not declared in this scope
     queue<int> q;
     ^
0_0_36924759_5699.cpp:50:11: error: expected primary-expression before 'int'
     queue<int> q;
           ^
0_0_36924759_5699.cpp:51:33: error: 'memset' was not declared in this scope
     memset(depth,0,sizeof(depth));
                                 ^
0_0_36924759_5699.cpp:53:5: error: 'q' was not declared in this scope
     q.push(s);
     ^