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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. const int N=1e6+10;
  4. stack<int> a;
  5. int arr[N],ans[N],brr[N];
  6. int main() {
  7. 	int n;
  8. 	cin>>n;
  9. 	for(int i=1;i<=n;i++){
  10. 		cin>>arr[i]>>brr[i];
  11. 	}
  12. 	for(int i=n;i>=1;i--){
  13. 		while(!a.empty()&&arr[a.top()]<=arr[i]){
  14. 			a.pop();
  15. 		}
  16. 		if(a.empty()){
  17. 			ans[i]=0;
  18. 		}else{
  19. 			ans[i]=a.top();
  20. 		}
  21. 		a.push(i);
  22. 	}
  23. 	int maxx=0;
  24. 	for(int i=1;i<=n;i++){
  25. 		cout<<ans[i];
  26. 	}
  27. 	return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 7636KB
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https://ideone.com/ZduO7e
language:
C++ (gcc 8.3)
created:
5 hours ago
visibility:
public

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