Submission #1217358

#	Time	Username	Problem	Language	Result	Execution time	Memory
1217358		maomao	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	98 ms	4312 KiB

Main

#include <iostream>
using namespace std;
#define ll long long
#define fori(n) for(int i=1;i<=n;i++)
int main() {
    int n; cin >> n;
    int h[n+1];h[0]=0;
    fori(n) cin >> h[i];
    //precompute the cost so far if chose (i,n+1-i)
    ll pre[n+1] = {0};
    for(int i=2;i<=n;i++) pre[i] = pre[i-1] + max(0,h[i-1]-h[i]+1);
    ll suf[n+1] = {0};
    for(int i=n-1;i>=1;i--) suf[i] = suf[i+1] + max(0,h[i+1]-h[i]+1);
    
    ll ans = min(pre[n],suf[1]);
    fori(n-1) ans = min(ans,max(pre[i],suf[i])); //max pre[i] suf[i] to water range(i,n+1-i) and suffice both ends
    cout << ans;
    return 0;
}

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