Submission #492693

#	Time	Username	Problem	Language	Result	Execution time	Memory
492693		Ronin13	Bigger segments (IZhO19_segments)	C++14	0 / 100	0 ms	204 KiB

segments

#include<bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define epb emplace_back
#define pb push_back
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define inf 1e9+1
#define linf 1e18+1
using namespace std;
const int NMAX=2e7+1;
void solve(){
    int n;cin>>n;
    ll dp[n+1];
    ll DP[n+1];
    ll a[n+1];
    for(int i=1;i<=n;i++)cin>>a[i];
    ll pref[n+1];
    pref[0]=0;
    for(int i=1;i<=n;i++){
        pref[i]=pref[i-1]+a[i];
        dp[i]=1,DP[i]=pref[i];
    }
    dp[0]=0,DP[0]=0;
    for(int i=0;i<=n;i++){
        int l=i,r=n+1;
        while(l+1<r){
            int mid=(l+r)/2;
            if(pref[mid]-pref[i]>=DP[i])r=mid;
            else l=mid;
        }
        if(r==n+1){
            if(i<n){
                dp[i+1]=dp[i];
                DP[i+1]=DP[i]+a[i+1];
            }
            continue;
        }
        if(dp[r]>dp[i]+1)continue;
        dp[r]=dp[i]+1;
        DP[r]=pref[r]-pref[i];
        if(i<n){
            if(dp[i+1]>dp[i])continue;
            if(dp[i+1]==dp[i]){
                DP[i+1]=min(DP[i+1],DP[i]+a[i+1]);
                continue;
            }
            dp[i+1]=dp[i];
            DP[i+1]=DP[i]+a[i+1];
        }
    }
    cout<<dp[n];
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    //sieve();
    int test=1;//cin>>test;
    while(test--)solve();
return 0;
}

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