제출 #1010489

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1010489		Almonther	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++98	0 / 100	1 ms	348 KiB

Main

#include <bits/stdc++.h>

#define suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define co cout<<
//#pragma GCC optimize("O3,Ofast,unroll-loops")
//#pragma GCC target("avx2,sse3,sse4,avx")
using namespace std;
//stuff
ll n;
ll arr[1000001];
ll pref[100001];
ll suff[1000001];
ll val[1000001];
ll val1[1000001];
ll mn=1e18;
ll cnt=0;
void solve(){
    cin>>n;
    for(int i=1;i<=n;i++) cin>>arr[i];
    for(int i=2;i<=n;i++){
        ll last=arr[i-1]+val[i-1];
        ll diff=(last+1)-arr[i];
        val[i]=max(diff,0ll);
    }
    for(int i=1;i<=n;i++){
        pref[i]=pref[i-1];
        if(val[i]>val[i-1]) pref[i]+=val[i]-val[i-1];
    }
    for(int i=n-1;i>=1;i--){
        ll last=arr[i+1]+val1[i+1];
        ll diff=(last+1)-arr[i];
        val1[i]=max(diff,0ll);
    }
    for(int i=n;i>=1;i--){
        suff[i]=suff[i+1];
        if(val1[i]>val1[i+1]) suff[i]+=val1[i]-val1[i+1];
    }
    // for(int i=1;i<=n;i++){
    //     co pref[i-1]<<' '<<suff[i+1]<<'\n';
    //     if(i==5) co "here "<<pref[i]<<' '<<suff[i+1]<<'\n';
    // }
    // return;
    for(int i=1;i<=n;i++){
        ll ans=max(pref[i],suff[i]);
        if(pref[i]==suff[i]) ans++;
        mn=min(mn,ans);
    }
    co mn;
}

int main()
{
    suiii
    int tt=1;
    // cin>>tt;
    while(tt--){
        solve();
    }
    return 0;
}

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