View Compilation Error

0_0_32645048_3515.cpp: In function 'int spfa(int, int)':
0_0_32645048_3515.cpp:15:5: error: 'queue' was not declared in this scope
     queue<int> q;
     ^
0_0_32645048_3515.cpp:15:11: error: expected primary-expression before 'int'
     queue<int> q;
           ^
0_0_32645048_3515.cpp:16:5: error: 'q' was not declared in this scope
     q.push(s);
     ^
0_0_32645048_3515.cpp: In function 'int main()':
0_0_32645048_3515.cpp:39:30: error: 'scanf' was not declared in this scope
     while(~scanf("%d%d",&n,&m))
                              ^
0_0_32645048_3515.cpp:53:9: error: 'cout' was not declared in this scope
         cout<<spfa(s,t)<<endl;
         ^
0_0_32645048_3515.cpp:53:26: error: 'endl' was not declared in this scope
         cout<<spfa(s,t)<<endl;
                          ^