Submission #1010464

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010464		vjudge1	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	67 ms	11092 KiB

Main

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*******************************************************************************/
#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
    int n;
    cin>>n;
    int arr[n],a[n];
    for(int i=0;i<n;i++){
        cin>>arr[i];
        a[i]=arr[i];
    }
    int pre[n+1]={},suf[n+1]={},ansP[n+1]={},ansS[n+1]={};
    for(int i=1;i<n;i++){
        if(pre[i]<=arr[i-1]-arr[i]){
            pre[i]=((arr[i-1]-arr[i])-pre[i])+1;
            arr[i]=arr[i-1]+1;
        }
        else if(arr[i-1]-arr[i]>0) pre[i]=(arr[i-1]-arr[i])+1;
    }
    for(int i=n-2;i>=0;i--){
        if(suf[i]<=a[i+1]-a[i]){
            suf[i]=((a[i+1]-a[i])-suf[i])+1;
            a[i]=a[i+1]+1;
        }
        else if(a[i+1]-a[i]>0) suf[i]=(a[i+1]-a[i])+1;
    }
    int cnt=0;
    for(int i=1;i<n;i++){
        if(pre[i]-pre[i-1]>0) cnt+=pre[i]-pre[i-1];
        ansP[i]=cnt;
    }
    cnt=0;
    for(int i=n-2;i>=0;i--){
        if(suf[i]-suf[i+1]>0) cnt+=suf[i]-suf[i+1];
        ansS[i]=cnt;
    }
    int mn=1e18;
    for(int i=0;i<n;i++){
        if(i==0) mn=min(mn,ansS[i]);
        else if(i==n-1) mn=min(mn,ansP[i]);
        else {
            int ANS=max(ansP[i],ansS[i+1]);
            if(a[i+1]==arr[i]) ANS++;
            mn=min(ANS,mn);
        }
    }
    cout<<mn<<endl;
    return 0;
}

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