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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){
  33.  
  34. 	vector<int> dp(n+1, INF);
  35. 	dp[0] = 0;
  36. 	if(a[0] == 0) dp[1] = 0;
  37. 	else dp[1] = 1;
  38.  
  39. 	for(int i=2; i<=n; i++){
  40.  
  41. 		int j = i-1;
  42. 		while(j>=0){
  43.  
  44. 			if(a[j]+1 == i-j){
  45. 				dp[i] = min(dp[i], dp[j]);
  46. 			}
  47. 			else dp[i] = min(dp[i], dp[j] + i-j);
  48. 			j--;
  49. 		}
  50.  
  51. 	}
  52.  
  53. 	return dp[n];
  54. }
  55.  
  56.  
  57.  
  58.  
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66.  
  67.  
  68.  
  69.  
  70. int practice(int n){
  71.  
  72.  
  73.     return 0;
  74. }
  75.  
  76.  
  77.  
  78.  
  79.  
  80. void solve() {
  81.  
  82.     int n;
  83.     cin>> n;
  84.  
  85.     a.resize(n);
  86.     for(int i=0; i<n; i++) cin >> a[i];
  87.  
  88.     cout << consistency(n) << endl;
  89.  
  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 5288KB
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https://ideone.com/5nSa1W
language:
C++14 (gcc 8.3)
created:
12 hours ago
visibility:
public

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