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  1. #include <iostream>
  2. #include <stack>
  3. using namespace std;
  4.  
  5. int main() {
  6. stack<pair<int, int>> s;
  7. int n, sum=0;
  8. long input[80000];
  9. cin >> n;
  10. for (int i = 0 ; i < n ; i += 1) {
  11. cin >> input[i];
  12. }
  13. for (int i = n-1; i >= 0 ; i -= 1 ) {
  14. while (!s.empty() && s.top().second < input[i]) {
  15. s.pop();
  16. }
  17. if (s.empty()) {
  18. sum += n-1-i;
  19. } else {
  20. sum += s.top().first - i-1;
  21. }
  22. s.push(make_pair(i, input[i]));
  23. }
  24. cout << sum;
  25. return 0;
  26. }
Success #stdin #stdout 0s 5596KB
stdin
6
10
3
7
4
12
2
stdout
5