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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.  
  31. 	//* keep in mind  s<e   (Not s<=e )
  32. 	while(s<e){
  33. 		int sum = a[s] + a[e];
  34. 		if(sum > k){
  35. 			ans += (e-s);
  36. 			e--;
  37. 		}
  38. 		else{
  39. 			s++;
  40. 		}
  41. 	}
  42.  
  43. 	cout << ans << endl;
  44.  
  45. }
  46.  
  47.  
  48. void solve() {
  49.  
  50. 	int n, k;
  51. 	cin >> n >> k;
  52.  
  53. 	a.resize(n);
  54.  
  55. 	for(int i=0; i<n; i++) cin >> a[i];
  56.  
  57.     consistency(n, k);
  58.  
  59. }
  60.  
  61.  
  62.  
  63.  
  64.  
  65. int32_t main() {
  66.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  67.  
  68.     int t = 1;
  69.     // cin >> t;
  70.     while (t--) {
  71.         solve();
  72.     }
  73.  
  74.     return 0;
  75. }
Success #stdin #stdout 0.01s 5268KB
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https://ideone.com/c1ENho
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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