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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int              long long int
  4. #define double           long double
  5. inline int power(int a, int b) {
  6.     int x = 1;
  7.     while (b) {
  8.         if (b & 1) x *= a;
  9.         a *= a;
  10.         b >>= 1;
  11.     }
  12.     return x;
  13. }
  14.  
  15.  
  16. const int M = 1000000007;
  17. const int N = 3e5+9;
  18. const int INF = 2e9+1;
  19. const int LINF = 2000000000000000001;
  20.  
  21. //_ ***************************** START Below *******************************
  22.  
  23.  
  24.  
  25. vector<int> a;
  26. void consistency(int n, int k) {
  27.  
  28. 	int  s= 0, e = n-1;
  29. 	int ans = 0;
  30. 	while(s<=e){
  31. 		int sum = a[s] + a[e];
  32. 		if(sum > k){
  33. 			ans += (e-s);
  34. 			e--;
  35. 		}
  36. 		else{
  37. 			s++;
  38. 		}
  39. 	}
  40.  
  41. 	cout << ans << endl;
  42.  
  43. }
  44.  
  45.  
  46. void solve() {
  47.  
  48. 	int n, k;
  49. 	cin >> n >> k;
  50.  
  51. 	a.resize(n);
  52.  
  53. 	for(int i=0; i<n; i++) cin >> a[i];
  54.  
  55.     consistency(n, k);
  56.  
  57. }
  58.  
  59.  
  60.  
  61.  
  62.  
  63. int32_t main() {
  64.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  65.  
  66.     int t = 1;
  67.     // cin >> t;
  68.     while (t--) {
  69.         solve();
  70.     }
  71.  
  72.     return 0;
  73. }
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/8D7YzZ
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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