제출 #305074

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
305074		luciocf	Feast (NOI19_feast)	C++14	4 / 100	179 ms	8568 KiB

feast

#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

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

const int maxn = 3e5+10;
const ll inf = 6e12+10;

int n;
int a[maxn];

ll pref[maxn];

pii dp[maxn];

int qtd(ll c)
{	
	pii mx = {0, 0};

	for (int i = 1; i <= n; i++)
	{
		mx = max(mx, {dp[i-1].ff - pref[i-1], dp[i-1].ss});

		dp[i] = dp[i-1];

		if (pref[i] + mx.ff + c > dp[i].ff)
			dp[i] = {pref[i] + mx.ff + c, mx.ss+1};
	}

	return dp[n].ss;
}

int main(void)
{
	int k;
	scanf("%d %d", &n, &k);

	for (int i = 1; i <= n; i++)
	{
		scanf("%d", &a[i]);

		pref[i] = pref[i-1]+1ll*a[i];
	}

	ll ini = -inf, fim = inf, best = -inf;

	while (ini <= fim)
	{
		ll mid = (ini+fim)/2ll;

		if (qtd(mid) > k) fim = mid-1;
		else 
		{
			best = mid;

			if (qtd(mid) == k) fim = mid-1;
			else ini = mid+1;
		}
	}

	qtd(best);

	printf("%lld\n", dp[n].ff - 1ll*dp[n].ss*best);
}

컴파일 시 표준 에러 (stderr) 메시지

feast.cpp: In function 'int main()':
feast.cpp:41:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |  scanf("%d %d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~
feast.cpp:45:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

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