Submission #530314

#	Time	Username	Problem	Language	Result	Execution time	Memory
530314		soondro2266	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	332 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
vector<int> arr;
int n;
int check(int idx){
    vector<int> akr = arr;
    int a = 0,b = 0;
    for(int i = 1; i <= idx; i++){
        if(akr[i-1] >= akr[i]){
            a += akr[i-1]+1-akr[i];
        }
    }
    for(int i = n-1; i > idx; i--){
        if(akr[i-1] <= akr[i]){
            b += akr[i]+1-akr[i-1];
        }
    }
    return max(a,b);
}
signed main(){
    cin >> n;
    for(int i = 0,tmp; i < n; i++){
        cin >> tmp;
        arr.push_back(tmp);
    }
    /*for(int i = 0; i < n;i++){
        cout << check(i) << " ";
    }
    cout << endl;*/
    int l = 0, r = n-1,mid,a,b,c;
    while(1){
        if(r-l <= 4){
            break;
        }
        mid = (l+r)/2;
        a = check(mid);
        b = check(mid+1);
        c = check(mid-1);
        if(a < b && a < c){
            cout << a << endl;
            return 0;
        }
        else if(a < b){
            r = mid-1;
        }
        else{
            l = mid+1;
        }
    }
    int ans = 1e18;
    for(int i = l; i <= r; i++){
        ans = min(ans,check(i));
    }
    cout << ans << endl;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60