Submission #921406

#	Time	Username	Problem	Language	Result	Execution time	Memory
921406		TAhmed33	Group Photo (JOI21_ho_t3)	C++98	44 / 100	5006 ms	604 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int n, a[5001], dp[5001];
int cost (int l, int r) {
	vector <int> u;
	int cnt = 0, suff = 0;
	for (int i = n; i >= 1; i--) {
		if (a[i] >= l && a[i] <= r) {
			u.push_back(a[i]); cnt += suff;
		} else if (a[i] < l) suff++;
	}
	for (int j = 1; j < (int)u.size(); j++) {
		for (int l = j - 1; l >= 0; l--) {
			cnt += u[j] < u[l];
		}
	}
	return cnt;
}
int main () {
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) {
		dp[i] = 1e9;
		for (int j = i; j >= 1; j--) {
			dp[i] = min(dp[i], dp[j - 1] + cost(j, i));
		}
	}
	cout << dp[n] << '\n';
}

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