Submission #883660

#	Time	Username	Problem	Language	Result	Execution time	Memory
883660		OAleksa	Bigger segments (IZhO19_segments)	C++14	13 / 100	8 ms	20828 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int maxn = 5010;
const int inf = 1e18;
int n, a[maxn], dp[maxn][maxn], p[maxn];
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
  int tt = 1;
	//cin >> tt;
  while (tt--) {
   	cin >> n;
   	for (int i = 1;i <= n;i++)
   		cin >> a[i];
   	for (int i = 1;i <= n;i++)
   		p[i] = p[i - 1] + a[i];
   	for (int i = 0;i <= n;i++) {
   		for (int j = 0;j <= n;j++)
   			dp[i][j] = inf;
   	}
   	dp[0][0] = 0;
   	for (int i = 1;i <= n;i++) {
   		dp[i][1] = p[i];
   		for (int j = 2;j <= n;j++) {
   			int l = 0, r = i - 1, id = inf;
   			while (l <= r) {
   				int mid = (l + r) / 2;
   				int o = p[i] - p[mid];
   				if (o >= dp[mid][j - 1] || dp[mid][j - 1] == inf) {
   					if (dp[mid][j - 1] != inf)
							id = o;
						l = mid + 1;
   				}
   				else
   					r = mid - 1;
   			}
   			dp[i][j] = id;
   			// int sm = a[i];
   			// for (int k = i - 1;k >= 0;k--) {
   				// dp[i][j] = min(dp[i][j], (sm >= dp[k][j - 1] ? sm : inf));
   				// sm += a[k];
   			// }
   		}
   	}
   	// for (int i = 1;i <= n;i++) {
   		// for (int j = 1;j <= n;j++)
   			// cout << dp[i][j] << " ";
   		// cout << endl;
   	// }
		int ans = 0;
		for (int i = 1;i <= n;i++) {
			if (dp[n][i] != inf)
				ans = i;
		}
		cout << ans;
	}
	return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27