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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n; cin >> n;
  6. 	int arr[n];
  7. 	for(int i = 0; i < n; i++)
  8. 	cin >> arr[i];
  9.  
  10. 	int p[n] = {0}; int s[n] = {0};
  11. 	p[0] = {0};
  12. 	s[n-1] = {0};
  13. 	for(int i = 1; i < n; i++){
  14. 		for(int j = 0; j <= i-1; j++){
  15. 			if(arr[j] > arr[i])
  16. 			p[i]++;
  17. 		}
  18. 	}
  19. 	for(int i = n-2; i >= 0; i--){
  20. 		for(int j = n-1; j >= i+1; j--){
  21. 			if(arr[j] < arr[i])
  22. 			s[i]++;
  23. 		}
  24. 	}
  25. 	int cnt = 0;
  26. 	for(int i = 0; i < n; i++){
  27. 		for(int j = i+1; j < n; j++){
  28. 			if(arr[i] < arr[j])
  29. 			cnt = cnt + (p[i] * s[j]);
  30. 		}
  31. 	}
  32. 	cout << cnt;
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/RKLv1Q
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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