Submission #393109

#	Time	Username	Problem	Language	Result	Execution time	Memory
393109		ahmet	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	0 / 100	1 ms	460 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define zaman cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds "
#define rep(i,n) for(long long (i)=0;(i)<(n);++(i))
#define ref(i,a,b) for (long long (i)=(a); (i)<=(b); ++(i))	
#define endl '\n'
#define st first
#define nd second
#define ll long long
#define pb push_back
#define pii pair<ll,ll>
#define mp make_pair
const int mx=2e5+6;
ll a[mx];
ll l[mx],r[mx],b[mx],c[mx],ka[mx],kb[mx];
ll ans=1e18;
int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	int n;cin >> n;
	ref(i,1,n){
		cin >> a[i];
	}
	ll val=a[1]+1;
	ll res=0,need;
	ka[1]=a[1];
	for(int i=2;i<=n;++i){
		if(a[i]>val){
			ka[i]=val;
			val=a[i]+1;
			l[i]=l[i-1];
			b[i]=0;
			continue;
		}
		need=val-a[i];
		if(need<=b[i-1]){
			l[i]=l[i-1];
		}		
		else{
			l[i]=l[i-1]+need-b[i-1];
		}
		b[i]=need;
		ka[i]=val;
		++val;
	}
	val=a[n]+1;
	res=0;
	kb[n]=a[n];
	for(int i=n-1;i>=1;--i){
		if(a[i]>val){
			kb[i]=val;
			val=a[i]+1;
			r[i]=r[i+1];
			c[i]=0;
			continue;
		}
		need=val-a[i];
		if(need<=c[i+1]){
			r[i]=r[i+1];
		}		
		else{
			r[i]=r[i+1]+need-c[i+1];
		}
		c[i]=need;
		kb[i]=val;
		++val;
	}
	ans=min(r[1],l[n]);

	for(int i=2;i<=n-1;++i){
		ll left=ka[i-1];
		ll right=kb[i+1];
		ll kel=max(left,right)+1;
		need=kel-a[i]-max(c[i+1],b[i-1]);
		if(need<0)need=0;
		ll efl=min(c[i+1],b[i-1]);
		//if(i==4)cout <<i<<" "<<need<<" "<<efl<<" " << l[i-1]+r[i+1]+need-efl<< endl;
		ans=min(ans,l[i-1]+r[i+1]+need-efl);
	}


	cout << ans << endl;
}	

	

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:5:35: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
    5 | #define ref(i,a,b) for (long long (i)=(a); (i)<=(b); ++(i))
      |                                   ^
Main.cpp:20:2: note: in expansion of macro 'ref'
   20 |  ref(i,1,n){
      |  ^~~
Main.cpp:24:5: warning: variable 'res' set but not used [-Wunused-but-set-variable]
   24 |  ll res=0,need;
      |     ^~~

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