Submission #936713

#	Time	Username	Problem	Language	Result	Execution time	Memory
936713		Aiperiii	Bigger segments (IZhO19_segments)	C++14	100 / 100	169 ms	20932 KiB

segments

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    vector <int> a(n+1),p(n+1),ind(n+1),ans(n+1);
    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=1;i<=n;i++){
        ind[i]=max(ind[i],ind[i-1]);
        ans[i]=ans[ind[i]]+1;
        int cur=p[i]-p[ind[i]];
        //cout<<ind[i]<<" "<<ans[ind[i]]<<" "<<ans[i]<<"\n";
        int l=i,r=n;
        int p_ind=0;
        while(l<=r){
            int md=(l+r)/2;
            if(p[md]-p[i]>=cur){
                p_ind=md;
                r=md-1;
            }
            else l=md+1;
        }
        ind[p_ind]=i;
    }
    cout<<ans[n]<<"\n";
}
/*
4
2 3 1 7
5
6 2 3 9 13
3
3 1 2
5
1 12 11 46 47
 */

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