Submission #534828

#	Time	Username	Problem	Language	Result	Execution time	Memory
534828		Paul_Liao_1457	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	28 ms	8496 KiB

Main

// 還要更強
#include<iostream>
#include<queue>
#include<set>
#include<map>
#include<iomanip>
#include<math.h>
#include<cstring>
#include<stack>
#include<string.h>
#include<random>
#include<algorithm>
#include<vector>

#define ll long long
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a,b) for(int i=a;i>=b;i--)
#define INF (ll)(8e18)
#define pb push_back
#define AC ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

using namespace std;

ll b[200005],a[200005],pre[200005],suf[200005];

signed main(){
    AC;
    int n; cin>>n;
    FOR(i,1,n+1) cin>>a[i];
    FOR(i,2,n+1){
        b[i]=a[i]-a[i-1];
    }
    FOR(i,2,n+1){
        pre[i]=pre[i-1];
        if(b[i]<=0) pre[i]+=(1-b[i]);
    }
    REP(i,n,2){
        suf[i]=suf[i+1];
        if(b[i]>=0) suf[i]+=(b[i]+1);
    }
    ll ans=min(suf[2],pre[n]);
    FOR(i,2,n+2){
        ans=min(ans,max(suf[i],pre[i-1]));
    }
    cout<<ans<<endl;
}

• Subtask 1: 40 / 40
• Subtask 2: 60 / 60