답안 #305053

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
305053	2020-09-22T13:28:32 Z	luciocf	Feast (NOI19_feast)	C++14	59 / 100	146 ms	8576 KB

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 = 1e13+10;

int n;
int a[maxn];

ll pref[maxn];

pii dp[maxn];

int qtd(ll c)
{
	memset(dp, 0, sizeof dp);
	
	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] = max(dp[i-1], {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 = 0, best = -inf;

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

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

	qtd(best);

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

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |  scanf("%d %d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~
feast.cpp:44:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

Subtask #1

0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	109 ms	8440 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #2

0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	99 ms	8444 KB	Output is correct
2	Correct	100 ms	8576 KB	Output is correct
3	Correct	98 ms	8440 KB	Output is correct
4	Incorrect	104 ms	8440 KB	Output isn't correct
5	Halted	0 ms	0 KB	-

Subtask #3

18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	145 ms	8440 KB	Output is correct
2	Correct	145 ms	8440 KB	Output is correct
3	Correct	145 ms	8440 KB	Output is correct
4	Correct	142 ms	8568 KB	Output is correct
5	Correct	141 ms	8440 KB	Output is correct
6	Correct	146 ms	8568 KB	Output is correct
7	Correct	143 ms	8568 KB	Output is correct
8	Correct	140 ms	8444 KB	Output is correct
9	Correct	141 ms	8568 KB	Output is correct
10	Correct	144 ms	8568 KB	Output is correct

Subtask #4

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	4992 KB	Output is correct
2	Correct	14 ms	4992 KB	Output is correct
3	Correct	14 ms	4992 KB	Output is correct
4	Correct	12 ms	4992 KB	Output is correct
5	Correct	13 ms	4992 KB	Output is correct
6	Correct	13 ms	4992 KB	Output is correct
7	Correct	12 ms	4992 KB	Output is correct
8	Correct	13 ms	4992 KB	Output is correct
9	Correct	13 ms	4992 KB	Output is correct
10	Correct	13 ms	4992 KB	Output is correct

Subtask #5

11.0 / 11.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	4992 KB	Output is correct
2	Correct	14 ms	4992 KB	Output is correct
3	Correct	14 ms	4992 KB	Output is correct
4	Correct	12 ms	4992 KB	Output is correct
5	Correct	13 ms	4992 KB	Output is correct
6	Correct	13 ms	4992 KB	Output is correct
7	Correct	12 ms	4992 KB	Output is correct
8	Correct	13 ms	4992 KB	Output is correct
9	Correct	13 ms	4992 KB	Output is correct
10	Correct	13 ms	4992 KB	Output is correct
11	Correct	13 ms	4992 KB	Output is correct
12	Correct	12 ms	4992 KB	Output is correct
13	Correct	14 ms	4992 KB	Output is correct
14	Correct	14 ms	4992 KB	Output is correct
15	Correct	13 ms	4992 KB	Output is correct
16	Correct	12 ms	4992 KB	Output is correct
17	Correct	13 ms	4992 KB	Output is correct
18	Correct	13 ms	4992 KB	Output is correct
19	Correct	14 ms	4992 KB	Output is correct
20	Correct	14 ms	5120 KB	Output is correct

Subtask #6

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	4992 KB	Output is correct
2	Correct	14 ms	4992 KB	Output is correct
3	Correct	14 ms	4992 KB	Output is correct
4	Correct	12 ms	4992 KB	Output is correct
5	Correct	13 ms	4992 KB	Output is correct
6	Correct	13 ms	4992 KB	Output is correct
7	Correct	12 ms	4992 KB	Output is correct
8	Correct	13 ms	4992 KB	Output is correct
9	Correct	13 ms	4992 KB	Output is correct
10	Correct	13 ms	4992 KB	Output is correct
11	Correct	13 ms	4992 KB	Output is correct
12	Correct	12 ms	4992 KB	Output is correct
13	Correct	14 ms	4992 KB	Output is correct
14	Correct	14 ms	4992 KB	Output is correct
15	Correct	13 ms	4992 KB	Output is correct
16	Correct	12 ms	4992 KB	Output is correct
17	Correct	13 ms	4992 KB	Output is correct
18	Correct	13 ms	4992 KB	Output is correct
19	Correct	14 ms	4992 KB	Output is correct
20	Correct	14 ms	5120 KB	Output is correct
21	Correct	13 ms	5024 KB	Output is correct
22	Correct	13 ms	4992 KB	Output is correct
23	Correct	14 ms	4992 KB	Output is correct
24	Correct	14 ms	4992 KB	Output is correct
25	Correct	13 ms	4992 KB	Output is correct
26	Correct	14 ms	4992 KB	Output is correct
27	Correct	14 ms	4992 KB	Output is correct
28	Correct	14 ms	5120 KB	Output is correct
29	Correct	13 ms	4992 KB	Output is correct
30	Correct	13 ms	4992 KB	Output is correct

Subtask #7

0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	109 ms	8440 KB	Output isn't correct
2	Halted	0 ms	0 KB	-