Submission #1057434

#	Time	Username	Problem	Language	Result	Execution time	Memory
1057434		Minbaev	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	17 ms	7012 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
 
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast,unroll-loops")
 
using namespace std;
using namespace __gnu_pbds;
 
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define f first
#define s second
#define int long long
#define ll long long
#define pii pair<int,int>
#define ar array
 
template<class T>bool umax(T &a,T b){if(a<b){a=b;return true;}return false;}
template<class T>bool umin(T &a,T b){if(b<a){a=b;return true;}return false;}
 
template<class T> using st = tree<T, null_type, less_equal<T>, 
rb_tree_tag, tree_order_statistics_node_update>;
 
const int inf = 1e17 + 7;
const int mod = 1e9 + 7;
const int N = 3e5 + 5;
const int md = 998244353;
 
int binpow(int a, int b){
	if(b == 0)return 1;
	if(b % 2 == 0){
		int c = binpow(a,b/2);
		return (c*c)%mod;
	}
	return (binpow(a,b-1)*a)%mod;
}
 
int divi(int a, int b){
	return (a*(binpow(b,mod-2)))%mod;
}
 
int n,m,k;

void solve(){
	
	cin >> n;
	vector<int>v(n);
	
	for(auto &to:v)cin >> to;
	vector<int>pref(n+2),suff(n+2);
	
	for(int i = 2;i<=n;i++){
		pref[i] = pref[i-1];
		pref[i] += max(0ll, v[i-2]-v[i-1] + 1);
	}
	
	for(int i = n-1;i>=1;i--){
		suff[i] = suff[i+1];
		suff[i] += max(0ll, v[i]-v[i-1]+1);
	}
	
	int ans = inf;
	
	for(int i = 1;i<=n;i++){
		
		//~ cout << pref[i] << "  ";
		umin(ans, max(pref[i] , suff[i]) );
	}
	//~ cout << "\n";
	//~ for(int i = 1;i<=n;i++){
		//~ cout << suff[i] << " ";
	//~ }
	cout << ans << "\n";
}
/*

*/
 signed main()
{
//	freopen("seq.in", "r", stdin);
//  freopen("seq.out", "w", stdout);
	ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
	int tt=1;//cin>>tt;
	while(tt--)solve();
 
}
 

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