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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.  
  32. int consistency(int n, int k){
  33.  
  34. 	vector<int> dp(n, 0);
  35. 	dp[0] = 0;
  36. 	dp[1] = a[0] * a[1];
  37.  
  38. 	for(int i=2; i<n; i++){
  39.  
  40. 		int mini = INT32_MAX;
  41. 		for(int j=i-1; j>=max(0LL, i-k); j--){
  42. 			mini = min(mini,  dp[j] + a[j] * a[i] );
  43. 		}
  44. 		dp[i] = mini;
  45.  
  46. 	}
  47. 	return dp[n-1];
  48. }
  49.  
  50.  
  51.  
  52.  
  53.  
  54.  
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64. int practice(int n){
  65.  
  66.  
  67.     return 0;
  68. }
  69.  
  70.  
  71.  
  72.  
  73.  
  74. void solve() {
  75.  
  76.     int n, k;
  77.     cin>> n >> k;
  78.  
  79.     a.resize(n);
  80.     for(int i=0; i<n; i++) cin >> a[i];
  81.  
  82.     cout << consistency(n, k) << endl;
  83.  
  84.  
  85. }
  86.  
  87.  
  88.  
  89.  
  90.  
  91. int32_t main() {
  92.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  93.  
  94.     int t = 1;
  95.     // cin >> t;
  96.     while (t--) {
  97.         solve();
  98.     }
  99.  
  100.     return 0;
  101. }
Success #stdin #stdout 0s 5320KB
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stdin
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5 3
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stdout
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-49
https://ideone.com/SJJF15
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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