Submission #524706

#	Time	Username	Problem	Language	Result	Execution time	Memory
524706		DragonO_o	Bigger segments (IZhO19_segments)	C++17	100 / 100	70 ms	20832 KiB

segments

#include <bits/stdc++.h>

using namespace std;

#define x first
#define y second
#define pb push_back
#define all(a) a.begin(),a.end()
#define int long long

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int,int>pii;
typedef pair<ll,ll>pll;
typedef vector<ll>vll;
typedef vector<int>vi;
typedef vector<bool>vb;
typedef vector<vi>vvi;
typedef vector<vll>vvll;
typedef vector<pii>vpii;
typedef vector<pll>vpll;

const int N=5e5+55;

int a[N],b[N],dp[N],pref[N];

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    for(int i=1;i<=n;++i){
        cin>>a[i];
        pref[i]=pref[i-1]+a[i];
    }
    for(int i=1;i<=n;++i){
        b[i]=max(b[i],b[i-1]);
        dp[i]=dp[b[i]]+1;
        int l=i+1,r=n+1;
        while(l<r){
            int mid=(l+r)/2;
            if(pref[mid]-pref[i]<pref[i]-pref[b[i]]){
                l=mid+1;
            }
            else{
                r=mid;
            }
        }
        b[l]=i;
    }
    cout<<dp[n];
}

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