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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. inline int power(int a, int b) {
  7.     int x = 1;
  8.     while (b) {
  9.         if (b & 1) x *= a;
  10.         a *= a;
  11.         b >>= 1;
  12.     }
  13.     return x;
  14. }
  15.  
  16.  
  17. const int M = 1000000007;
  18. const int N = 3e5+9;
  19. const int INF = 2e9+1;
  20. const int LINF = 2000000000000000001;
  21.  
  22. //_ ***************************** START Below *******************************
  23.  
  24. vector<int> a;
  25.  
  26. bool isPossible(int n, int k, vector<int>& a, int mid){
  27.     int cows = 1;
  28.     for(int i=0; i<n; ){
  29.         int j = i+1;
  30.         while(j<n && a[j] - a[i] < mid) j++;
  31.         if(j==n) break;
  32.         cows++;
  33.         i = j;
  34.     }
  35.     return cows>=k; 
  36. }
  37.  
  38. int consistency(int n, int k, vector<int>& a){
  39.     sort(begin(a), end(a));
  40.  
  41.     int s = 0, e = INF;
  42.     int ans = 0;
  43.     while(s<=e){
  44.         int mid = s + (e-s)/2;
  45.         if(isPossible(n, k, a, mid)){
  46.             ans = max(ans, mid);
  47.             s = mid+1;
  48.         }
  49.         else{ 
  50.             e = mid-1;
  51.         }
  52.  
  53.     }
  54.  
  55.     return ans;
  56.  
  57. }
  58.  
  59.  
  60. void solve() {
  61.  
  62.     int n, k;
  63.     cin>>n >> k;
  64.     a.resize(n);
  65.  
  66.     for(int i=0; i<n; i++) cin >> a[i];
  67.     cout << consistency(n, k, a) << endl;
  68.  
  69.  
  70. }
  71.  
  72.  
  73.  
  74.  
  75.  
  76. int32_t main() {
  77.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  78.  
  79.     int t = 1;
  80.     // cin >> t;
  81.     while (t--) {
  82.         solve();
  83.     }
  84.  
  85.     return 0;
  86. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
5 3
1 2 8 4 9
stdout 
3
https://ideone.com/BG2JCn
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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