제출 #945919

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
945919		Warinchai	Safety (NOI18_safety)	C++14	100 / 100	45 ms	7036 KiB

safety

#include<bits/stdc++.h>
#define int long long
using namespace std;
int ar[200005];
priority_queue<int>pql;
priority_queue<int,vector<int>,greater<int>>pqr;
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n,h;cin>>n>>h;
    for(int i=1;i<=n;i++)cin>>ar[i];
    int ans=0;
    int lzl=0;
    int lzr=0;
    for(int i=1;i<=n;i++){
        if(i!=1&&(ar[i]<pql.top()+lzl)){
            ans+=pql.top()+lzl-ar[i];
            pql.push(ar[i]-lzl);
            pql.push(ar[i]-lzl);
            pqr.push(pql.top()+lzl-lzr);
            pql.pop();
        }else if(i!=1&&(ar[i]>pqr.top()+lzr)){
            ans+=ar[i]-(pqr.top()+lzr);
            pqr.push(ar[i]-lzr);
            pqr.push(ar[i]-lzr);
            pql.push(pqr.top()+lzr-lzl);
            pqr.pop();
        }else{
            pql.push(ar[i]-lzl);
            pqr.push(ar[i]-lzr);
        }
        lzl-=h;
        lzr+=h;
        ///cout<<ans<<" "<<pql.top()+lzl<<' '<<pqr.top()+lzr<<"\n";
    }
    cout<<ans;
}

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