Submission #916739

#	Time	Username	Problem	Language	Result	Execution time	Memory
916739		NintsiChkhaidze	Group Photo (JOI21_ho_t3)	C++17	44 / 100	5058 ms	600 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define s second
#define f first
#define pb push_back
#define pii pair <int,int>
#define left (h<<1),l,(l + r)/2
#define right ((h<<1)|1),(l + r)/2 + 1,r
#define int ll 
using namespace std;

const int N = 5e3 + 3,inf = 1e18;

int a[N],dp[N],id[N],b[N],val[N],pr[N];

signed main() {
	ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);

	int n;
	cin>>n;

	for (int i = 1; i <= n; i++)
		cin >> a[i],dp[i] = inf,id[a[i]] = i;

	//neli  

	for (int i = 1; i <= n; i++){
		int c=0;
		for (int j = 1; j <= n; j++){
			if (a[j] > i) ++c;
			val[j] = c; 
		}

		for (int j = 1; j <= n; j++){
			pr[j] = pr[j - 1] + val[id[j]];
		}

		for (int k = 1; k <= i; k++){
			int cost = pr[i] - pr[i - k]; //marcxniv ramdenia i-ze meti

			//anti inverse ebis raodenoba [i - k + 1, i] shualedshi
			for (int j = 1; j <= n; j++)
				b[j] = 0;

			for (int j = i; j >= i - k + 1; j--){
				b[id[j]] = 1;
				for (int w = id[j] + 1; w <= n; w++)
					cost += b[w];
			}
			dp[i] = min(dp[i],dp[i - k] + cost);
		}
	}

	cout<<dp[n];
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 32 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36