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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. const int inf = 1e9 + 5;
  6. const int N = 1e5 + 5;
  7.  
  8. int n, k, a[N], dp[N], bef[N];
  9. pair < int, int > p[N];
  10.  
  11. int main () {
  12.  
  13.     cin >> n >> k;
  14.  
  15.     for(int i = 1; i <= n; i++) {
  16.         cin >> a[i];
  17.         bef[i] = max(bef[i - 1], a[i]);
  18.     }
  19.  
  20.     for(int j = 2; j <= k; j++) {
  21.         int sz = 0;
  22.         for(int i = 1; i <= n; i++) {
  23.             int ans = j <= i ? bef[i - 1] : inf;
  24.             bef[i - 1] = dp[i - 1];
  25.             while(sz and a[i] >= p[sz - 1].first)
  26.                 ans = min(ans, p[--sz].second);
  27.             if(!sz or a[i] + ans < p[sz - 1].first + p[sz - 1].second)
  28.                 p[sz++] = make_pair(a[i], ans);
  29.             dp[i] = p[sz - 1].first + p[sz - 1].second;
  30.         }
  31.         bef[n] = dp[n];
  32.     }
  33.  
  34.     cout << bef[n] << endl;
  35.  
  36.     return 0;
  37.  
  38. }
  39.  
Success #stdin #stdout 0s 5052KB
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https://ideone.com/dIm4c3
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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