답안 #345626

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
345626	2021-01-07T16:51:08 Z	Nursik	Feast (NOI19_feast)	C++14	51 / 100	43 ms	22252 KB

feast

#include <bits/stdc++.h>

#define f first
#define s second
#define ll long long
#define pb push_back
#define all(v) v.begin(),v.end() 
#define ld long double

using namespace std; 
 
void data() {
	#ifdef NURS
        freopen("main.in", "r", stdin);
        freopen("main.out", "w", stdout);
    #endif	
} 
void win()
{	
	ios_base::sync_with_stdio(0),
	cin.tie(0),cout.tie(0);
}

int block = 400;
const ld eps = 1e-6; 

const int N = 1e6 + 500;
const int mod = 1e9 + 7;

const ll hh = 100010683;
const ll hh2 = 150005819;

int n, k, g, pos;
ll a[N];
ll s, ans;
ll dp[5000][5000], dp2[5000][5000], pref[5000];
int main()
{
	data();              
	win();        
	cin >> n >> k;
	bool was = 0;
	for (int i = 1; i <= n; i++)
	{
		cin >> a[i];
		was = was | (a[i] < 0), s += a[i];
		if (a[i] < 0)
			g++, pos = i;
		pref[i] += pref[i - 1] + a[i];
	}
	//first subtask
	if (was == 0)
	{
		cout << s << '\n';
		return 0;
	}
	//second subtask
	if (g == 1 && k >= 2)
	{
		cout << s - a[pos] << '\n';
		return 0;	
	}
	else if (g == 1 && k == 1)
	{
		ans = max(ans, s);
		s = 0;
		for (int i = 1; i < pos; i++)
			s += a[i];
		ans = max(ans, s), s = 0;
		for (int i = pos + 1; i <= n; i++)
			s += a[i];
		ans = max(ans, s);
		cout << ans << '\n';
		return 0;
	}
	//3 subtask
	ll mn = 0;
	for (int i = 1; i <= n; i++)
	{
		ans = max(ans, pref[i] - mn);
		if (i == 1)
			mn = pref[i];
		else
			mn = min(mn, pref[i]);	
	}
	if (k == 1)
	{
		cout << ans;
		return 0;
	}
	//4, 5 subtasks
	if (n <= 300)
	{
		for (int i = 0; i <= n; i++)
		{
			for (int j = 0; j <= k; j++)
			{
				dp[i][j] = -1e9;
			} 
		}
		dp[0][0] = 0;
		for (int i = 1; i <= n; i++)
		{
			for (int j = 1; j <= k; j++)
			{
				for (int len = 0; len <= i; len++)
				{
					if (dp[i - len][j - 1] != -1e9)
					{
						dp[i][j] = max(dp[i - len][j - 1] + pref[i] - pref[i - len], dp[i][j]); 
					}
				}
				dp[i][j] = max(dp[i][j], dp[i - 1][j]);
				if (i == n && j == k)
					ans = max(ans, dp[i][j]);
			}
			dp[i][0] = max(dp[i][0], dp[i - 1][0]);
		}
		cout << ans;
	}
	else
	{
		for (int i = 0; i <= n; i++)
		{
			for (int j = 0; j <= k; j++)
			{
				dp[i][j] = -1e9, dp2[i][j] = -1e9;;
			} 
		}
		dp[0][0] = 0, dp2[0][0] = 0;
		for (int i = 1; i <= n; i++)
		{
			for (int j = 1; j <= k; j++)
			{
				dp[i][j] = max(dp[i][j], dp[i - 1][j] + a[i]);
				dp[i][j] = max(dp[i][j], dp2[i - 1][j - 1] + a[i]);
				dp2[i][j] = max(dp2[i - 1][j], dp2[i][j]);
				dp2[i][j] = max(dp2[i][j], dp[i][j]);
				ans = max(ans, dp2[i][j]);
				ans = max(ans, dp[i][j]);
			}
		}
		cout << ans;	
	}
}

Subtask #1
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	36 ms	4844 KB	Output is correct
2	Correct	35 ms	4972 KB	Output is correct
3	Correct	35 ms	5100 KB	Output is correct
4	Correct	35 ms	4972 KB	Output is correct
5	Correct	36 ms	4972 KB	Output is correct
6	Correct	34 ms	4844 KB	Output is correct
7	Correct	34 ms	4844 KB	Output is correct
8	Correct	35 ms	4972 KB	Output is correct
9	Correct	34 ms	4872 KB	Output is correct
10	Correct	35 ms	4972 KB	Output is correct

Subtask #2
8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	24 ms	4972 KB	Output is correct
2	Correct	25 ms	5100 KB	Output is correct
3	Correct	25 ms	4972 KB	Output is correct
4	Correct	24 ms	4972 KB	Output is correct
5	Correct	35 ms	4992 KB	Output is correct
6	Correct	24 ms	4972 KB	Output is correct
7	Correct	24 ms	5100 KB	Output is correct
8	Correct	35 ms	4972 KB	Output is correct
9	Correct	35 ms	4844 KB	Output is correct
10	Correct	24 ms	4972 KB	Output is correct

Subtask #3
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	41 ms	4972 KB	Output is correct
2	Correct	40 ms	4972 KB	Output is correct
3	Correct	41 ms	4972 KB	Output is correct
4	Correct	40 ms	4972 KB	Output is correct
5	Correct	41 ms	5120 KB	Output is correct
6	Correct	41 ms	4972 KB	Output is correct
7	Correct	43 ms	5100 KB	Output is correct
8	Correct	40 ms	4972 KB	Output is correct
9	Correct	41 ms	5100 KB	Output is correct
10	Correct	41 ms	4972 KB	Output is correct

Subtask #4
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	748 KB	Output is correct
3	Correct	1 ms	620 KB	Output is correct
4	Correct	1 ms	640 KB	Output is correct
5	Correct	1 ms	620 KB	Output is correct
6	Correct	1 ms	620 KB	Output is correct
7	Correct	1 ms	620 KB	Output is correct
8	Correct	1 ms	620 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	620 KB	Output is correct

Subtask #5
11.0 / 11.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	748 KB	Output is correct
3	Correct	1 ms	620 KB	Output is correct
4	Correct	1 ms	640 KB	Output is correct
5	Correct	1 ms	620 KB	Output is correct
6	Correct	1 ms	620 KB	Output is correct
7	Correct	1 ms	620 KB	Output is correct
8	Correct	1 ms	620 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	620 KB	Output is correct
11	Correct	6 ms	1644 KB	Output is correct
12	Correct	7 ms	1516 KB	Output is correct
13	Correct	4 ms	1420 KB	Output is correct
14	Correct	6 ms	1516 KB	Output is correct
15	Correct	4 ms	1516 KB	Output is correct
16	Correct	3 ms	1516 KB	Output is correct
17	Correct	7 ms	1644 KB	Output is correct
18	Correct	1 ms	1516 KB	Output is correct
19	Correct	2 ms	1516 KB	Output is correct
20	Correct	2 ms	1516 KB	Output is correct

Subtask #6
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	364 KB	Output is correct
2	Correct	1 ms	748 KB	Output is correct
3	Correct	1 ms	620 KB	Output is correct
4	Correct	1 ms	640 KB	Output is correct
5	Correct	1 ms	620 KB	Output is correct
6	Correct	1 ms	620 KB	Output is correct
7	Correct	1 ms	620 KB	Output is correct
8	Correct	1 ms	620 KB	Output is correct
9	Correct	0 ms	364 KB	Output is correct
10	Correct	1 ms	620 KB	Output is correct
11	Correct	6 ms	1644 KB	Output is correct
12	Correct	7 ms	1516 KB	Output is correct
13	Correct	4 ms	1420 KB	Output is correct
14	Correct	6 ms	1516 KB	Output is correct
15	Correct	4 ms	1516 KB	Output is correct
16	Correct	3 ms	1516 KB	Output is correct
17	Correct	7 ms	1644 KB	Output is correct
18	Correct	1 ms	1516 KB	Output is correct
19	Correct	2 ms	1516 KB	Output is correct
20	Correct	2 ms	1516 KB	Output is correct
21	Incorrect	16 ms	22252 KB	Output isn't correct
22	Halted	0 ms	0 KB	-

Subtask #7
0 / 29.0

#	결과	실행 시간	메모리	Grader output
1	Correct	36 ms	4844 KB	Output is correct
2	Correct	35 ms	4972 KB	Output is correct
3	Correct	35 ms	5100 KB	Output is correct
4	Correct	35 ms	4972 KB	Output is correct
5	Correct	36 ms	4972 KB	Output is correct
6	Correct	34 ms	4844 KB	Output is correct
7	Correct	34 ms	4844 KB	Output is correct
8	Correct	35 ms	4972 KB	Output is correct
9	Correct	34 ms	4872 KB	Output is correct
10	Correct	35 ms	4972 KB	Output is correct
11	Correct	24 ms	4972 KB	Output is correct
12	Correct	25 ms	5100 KB	Output is correct
13	Correct	25 ms	4972 KB	Output is correct
14	Correct	24 ms	4972 KB	Output is correct
15	Correct	35 ms	4992 KB	Output is correct
16	Correct	24 ms	4972 KB	Output is correct
17	Correct	24 ms	5100 KB	Output is correct
18	Correct	35 ms	4972 KB	Output is correct
19	Correct	35 ms	4844 KB	Output is correct
20	Correct	24 ms	4972 KB	Output is correct
21	Correct	41 ms	4972 KB	Output is correct
22	Correct	40 ms	4972 KB	Output is correct
23	Correct	41 ms	4972 KB	Output is correct
24	Correct	40 ms	4972 KB	Output is correct
25	Correct	41 ms	5120 KB	Output is correct
26	Correct	41 ms	4972 KB	Output is correct
27	Correct	43 ms	5100 KB	Output is correct
28	Correct	40 ms	4972 KB	Output is correct
29	Correct	41 ms	5100 KB	Output is correct
30	Correct	41 ms	4972 KB	Output is correct
31	Correct	1 ms	364 KB	Output is correct
32	Correct	1 ms	748 KB	Output is correct
33	Correct	1 ms	620 KB	Output is correct
34	Correct	1 ms	640 KB	Output is correct
35	Correct	1 ms	620 KB	Output is correct
36	Correct	1 ms	620 KB	Output is correct
37	Correct	1 ms	620 KB	Output is correct
38	Correct	1 ms	620 KB	Output is correct
39	Correct	0 ms	364 KB	Output is correct
40	Correct	1 ms	620 KB	Output is correct
41	Correct	6 ms	1644 KB	Output is correct
42	Correct	7 ms	1516 KB	Output is correct
43	Correct	4 ms	1420 KB	Output is correct
44	Correct	6 ms	1516 KB	Output is correct
45	Correct	4 ms	1516 KB	Output is correct
46	Correct	3 ms	1516 KB	Output is correct
47	Correct	7 ms	1644 KB	Output is correct
48	Correct	1 ms	1516 KB	Output is correct
49	Correct	2 ms	1516 KB	Output is correct
50	Correct	2 ms	1516 KB	Output is correct
51	Incorrect	16 ms	22252 KB	Output isn't correct
52	Halted	0 ms	0 KB	-

답안 #345626

Compilation message

Subtask #1 4.0 / 4.0

Subtask #2 8.0 / 8.0

Subtask #3 18.0 / 18.0

Subtask #4 10.0 / 10.0

Subtask #5 11.0 / 11.0

Subtask #6 0 / 20.0

Subtask #7 0 / 29.0

Subtask #1
4.0 / 4.0

Subtask #2
8.0 / 8.0

Subtask #3
18.0 / 18.0

Subtask #4
10.0 / 10.0

Subtask #5
11.0 / 11.0

Subtask #6
0 / 20.0

Subtask #7
0 / 29.0