Submission #371264

#	Time	Username	Problem	Language	Result	Execution time	Memory
371264		arnold518	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	38 ms	5100 KiB

Main

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;
const ll INF = 1e18;

int N;
ll A[MAXN+10];
ll ans=INF;

ll B[MAXN+10], C[MAXN+10];

int main()
{
	scanf("%d", &N);
	for(int i=1; i<=N; i++) scanf("%lld", &A[i]);

	for(int i=2; i<=N; i++)
	{
		B[i]=B[i-1]+max(0ll, A[i-1]+1-A[i]);
	}
	for(int i=N-1; i>=1; i--)
	{
		C[i]=C[i+1]+max(0ll, A[i+1]+1-A[i]);
	}

	ll ans=INF;
	for(int i=1; i<N; i++)
	{
		ll t=max(B[i], C[i+1]);
		if(A[i]+B[i]==A[i+1]+C[i+1]) t++;
		ans=min(ans, t);
	}
	ans=min(ans, B[N]);
	ans=min(ans, C[1]);
	printf("%lld\n", ans);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:19:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
Main.cpp:20:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |  for(int i=1; i<=N; i++) scanf("%lld", &A[i]);
      |                          ~~~~~^~~~~~~~~~~~~~~

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