Submission #497445

#	Time	Username	Problem	Language	Result	Execution time	Memory
497445		Nalrimet	Bigger segments (IZhO19_segments)	C++17	13 / 100	8 ms	12104 KiB

segments

#include <bits/stdc++.h>
 
#define ll long long
#define pb push_back
#define F first
#define S second
 
using namespace std;
 
const int N = 5 * 1e5 + 5;
const int inf = 1e9 + 7;
 
long long a[N], pref[N], dp[N], mn[N];
vector<int> v[N];
int n, old;
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
	cin >> n;
 
	v[0].pb(0);
//8
//7 2 3 5 1 4 6 10
	for(int i = 1; i <= n; ++i){
        cin >> a[i];
        pref[i] = pref[i - 1] + a[i];
        dp[i] = max(1ll, dp[i - 1]);
        mn[i] = inf;
        old = dp[i - 1];
        for(auto to : v[old]){
            if(pref[i] >= mn[to]){
                dp[i] = old + 1;
                mn[i] = min(mn[i], 2 * pref[i] - pref[to]);
            }
        }
        if(dp[i] == old){
        for(auto to : v[old - 1]){
            if(pref[i] >= mn[to]){
                mn[i] = min(mn[i], 2 * pref[i] - pref[to]);
            }
        }
        }
        if(mn[i] == inf){
            mn[i] = mn[i - 1] + a[i] * 2;
        }
        v[dp[i]].pb(i);
	}
 
	cout << dp[n];
 
	return 0;
}

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