View Compilation Error

0_0_25175744_25436.cpp: In function 'int bfs()':
0_0_25175744_25436.cpp:40:5: error: 'queue' was not declared in this scope
     queue<node>q;
     ^
0_0_25175744_25436.cpp:40:15: error: expected primary-expression before '>' token
     queue<node>q;
               ^
0_0_25175744_25436.cpp:40:16: error: 'q' was not declared in this scope
     queue<node>q;
                ^
0_0_25175744_25436.cpp:44:33: error: 'memset' was not declared in this scope
     memset(vis,false,sizeof(vis));
                                 ^
0_0_25175744_25436.cpp: In function 'int main()':
0_0_25175744_25436.cpp:75:18: error: 'scanf' was not declared in this scope
     scanf("%d",&k);
                  ^
0_0_25175744_25436.cpp:78:35: error: 'memset' was not declared in this scope
         memset(tn.g,0,sizeof(tn.g));
                                   ^
0_0_25175744_25436.cpp:86:28: error: 'printf' was not declared in this scope
         printf("%d\n",bfs());
                            ^