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View Compilation Error

0_0_33192431_5677.cpp: In function 'int main()':
0_0_33192431_5677.cpp:12:11: error: 'cin' was not declared in this scope
     while(cin>>n&&n!=0){
           ^
0_0_33192431_5677.cpp:13:54: error: 'scanf' was not declared in this scope
      for(int i=0;i<n;i++)scanf("%d%d",&s[i].x,&s[i].y);
                                                      ^
0_0_33192431_5677.cpp:14:20: error: 'sort' was not declared in this scope
      sort(s,s+n,cmp);
                    ^
0_0_33192431_5677.cpp:26:23: error: 'printf' was not declared in this scope
      printf("%d\n",ans);
                       ^
0_0_33192431_5677.cpp:27:5: error: expected '}' at end of input
     }
     ^


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