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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. #define print(a)         for(auto x : a) cout << x << " "; cout << endl
  6.  
  7.  
  8. const int M = 1000000007;
  9. const int N = 3e5+9;
  10. const int INF = 2e9+1;
  11. const int LINF = 2000000000000000001;
  12.  
  13. inline int power(int a, int b, int mod=M) {
  14.     int x = 1;
  15.     a %= mod;
  16.     while (b) {
  17.         if (b & 1) x = (x * a) % mod; 
  18.         a = (a * a) % mod;
  19.         b >>= 1;
  20.     }
  21.     return x;
  22. }
  23.  
  24.  
  25. //_ ***************************** START Below *******************************
  26.  
  27.  
  28.  
  29.  
  30. vector<int> a;
  31. int count(int n, int x){
  32. 	int ct = 0;
  33. 	int s = 0, e = 0;
  34.  
  35. 	while(e<n && s<n-1){
  36. 		if(s==e) e++;
  37. 		if(a[e]-a[s] <= x){
  38. 			e++;
  39. 			ct += e-s;
  40. 		}
  41. 		else{
  42. 			s++;
  43. 		}
  44.  
  45. 	}
  46.  
  47. 	return ct;
  48. }
  49.  
  50. int consistency(int n, int k){
  51.  
  52. 	sort(begin(a), end(a));
  53.  
  54. 	int s = 0, e = a[n-1]-a[0];
  55.  
  56. 	while(s<e){
  57. 		int mid = s + (e-s)/2;
  58. 		if(count(n, mid) >= k){
  59. 			e = mid;
  60. 		}
  61. 		else s = mid+1;
  62. 	}
  63.  
  64. 	return e;
  65.  
  66. }
  67.  
  68.  
  69.  
  70.  
  71.  
  72.  
  73.  
  74.  
  75.  
  76.  
  77.  
  78.  
  79.  
  80.  
  81.  
  82. int practice(int n, int k){
  83.  
  84.  
  85.     return 0;
  86. }
  87.  
  88.  
  89.  
  90.  
  91.  
  92. void solve() {
  93.  
  94.     int n, k;
  95.     cin>> n >> k;
  96.  
  97.     a.resize(n);
  98.     for(int i=0; i<n; i++) cin >> a[i];
  99.  
  100.     cout << consistency(n, k) << endl;
  101.  
  102.  
  103. }
  104.  
  105.  
  106.  
  107.  
  108.  
  109. int32_t main() {
  110.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  111.  
  112.     int t = 1;
  113.     // cin >> t;
  114.     while (t--) {
  115.         solve();
  116.     }
  117.  
  118.     return 0;
  119. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/TsCy3L
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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