Submission #689338

#	Time	Username	Problem	Language	Result	Execution time	Memory
689338		Xiaoyang	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	30 ms	6968 KiB

Main

#include<bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long,long long>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl
#define pq priority_queue
#define inf (1ll<<60)
#define rep(i,a,b) for (int i=a;i<(b);i++)
#define MP make_pair
#define SZ(x) (int(x.size()))
#define ll long long
#define mod 1000000007
#define ALL(x) x.begin(),x.end()
#define endl "\n"
void inc(int &a,int b) {a=(a+b)%mod;}
void dec(int &a,int b) {a=(a-b+mod)%mod;}
int lowbit(int x) {return x&(-x);}
ll expo(ll base,ll p) {ll ret=1;while(p>0){if (p%2ll==1ll) ret=ret*base%mod;base=base*base%mod;p/=2ll;}return ret;}

const ll maxn=222222;
ll l[maxn],r[maxn],a[maxn];
int main(){
    ios::sync_with_stdio(0);
	cin.tie(0);
	ll n;cin>>n;
	rep(i,1,n+1)cin>>a[i];
	rep(i,2,n+1){
		l[i]=l[i-1]+max(0ll,a[i-1]-a[i]+1);
	}
	for(int i=n-1;i>=1;i--){
		r[i]=r[i+1]+max(0ll,a[i+1]-a[i]+1);
	}
	//~ rep(i,1,n+1)cout<<l[i]<<" ";
	//~ cout<<endl;
	//~ rep(i,1,n+1)cout<<r[i]<<" ";
	//~ cout<<endl;
	ll ans=inf;
	rep(i,1,n+1){
		ans=min(ans,max(l[i],r[i]));
	}
	cout<<ans;
	return 0;
}
/*

*/
	

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