fork download
copy 
  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 consistency1(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 << " ";
  44.  
  45. }
  46.  
  47.  
  48. //* Template 2
  49. //* Shrink Invlaid window 
  50. //* 	Invalid window => sum <= k
  51. //* 	Valid window => sum > k
  52.  
  53. void consistency2(int n, int k) {
  54.  
  55. 	int  s= 0, e = n-1;
  56. 	int ans = 0;
  57.  
  58.  
  59. 	while(e>=0){
  60. 		int sum = a[s] + a[e];
  61.  
  62. 		while(s<e && sum <= k){
  63. 			s++;
  64. 			sum = a[s] + a[e];
  65. 		}
  66. 		if(s==e) break;
  67.  
  68. 		ans += (e-s);
  69. 		e--;
  70. 	}
  71.  
  72. 	cout << ans << " ";
  73.  
  74. }
  75.  
  76.  
  77.  
  78. void solve() {
  79.  
  80. 	int n, k;
  81. 	cin >> n >> k;
  82.  
  83. 	a.resize(n);
  84.  
  85. 	for(int i=0; i<n; i++) cin >> a[i];
  86.  
  87.     consistency1(n, k);
  88.     consistency2(n, k);
  89.     cout << endl;
  90.  
  91. }
  92.  
  93.  
  94.  
  95.  
  96.  
  97. int32_t main() {
  98.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  99.  
  100.     int t = 1;
  101.     // cin >> t;
  102.     while (t--) {
  103.         solve();
  104.     }
  105.  
  106.     return 0;
  107. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin
copy 
5 8
1 2 7 9 10
stdout
copy 
8 8
https://ideone.com/hlAKfk
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!