oj.uz

답안 #347077

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
347077 2021-01-11T16:54:00 Z Nursik Feast (NOI19_feast) C++14
30 / 100
 55 ms 8112 KB 
#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
	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 = 0; j <= k; j++)
		{
			dp[i][j] = max(dp[i][j], dp[i - 1][j] + a[i]);
			if (j - 1 >= 0)
				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 46 ms 7660 KB Output is correct
2 Correct 37 ms 7788 KB Output is correct
3 Correct 44 ms 7904 KB Output is correct
4 Correct 37 ms 7916 KB Output is correct
5 Correct 37 ms 7788 KB Output is correct
6 Correct 36 ms 7660 KB Output is correct
7 Correct 36 ms 7660 KB Output is correct
8 Correct 39 ms 7916 KB Output is correct
9 Correct 36 ms 7660 KB Output is correct
10 Correct 36 ms 7916 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 32 ms 5996 KB Output is correct
2 Correct 26 ms 6124 KB Output is correct
3 Correct 24 ms 5996 KB Output is correct
4 Correct 24 ms 6124 KB Output is correct
5 Correct 36 ms 7688 KB Output is correct
6 Correct 25 ms 6044 KB Output is correct
7 Correct 25 ms 6124 KB Output is correct
8 Correct 37 ms 7916 KB Output is correct
9 Correct 36 ms 7656 KB Output is correct
10 Correct 25 ms 6124 KB Output is correct

Subtask #3
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 8044 KB Output is correct
2 Correct 54 ms 7948 KB Output is correct
3 Correct 54 ms 8044 KB Output is correct
4 Correct 42 ms 7916 KB Output is correct
5 Correct 42 ms 8044 KB Output is correct
6 Correct 55 ms 8072 KB Output is correct
7 Correct 43 ms 8044 KB Output is correct
8 Correct 42 ms 8044 KB Output is correct
9 Correct 45 ms 8112 KB Output is correct
10 Correct 43 ms 8044 KB Output is correct

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 1064 KB Output is correct
3 Incorrect 1 ms 1004 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 1064 KB Output is correct
3 Incorrect 1 ms 1004 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 1064 KB Output is correct
3 Incorrect 1 ms 1004 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 46 ms 7660 KB Output is correct
2 Correct 37 ms 7788 KB Output is correct
3 Correct 44 ms 7904 KB Output is correct
4 Correct 37 ms 7916 KB Output is correct
5 Correct 37 ms 7788 KB Output is correct
6 Correct 36 ms 7660 KB Output is correct
7 Correct 36 ms 7660 KB Output is correct
8 Correct 39 ms 7916 KB Output is correct
9 Correct 36 ms 7660 KB Output is correct
10 Correct 36 ms 7916 KB Output is correct
11 Correct 32 ms 5996 KB Output is correct
12 Correct 26 ms 6124 KB Output is correct
13 Correct 24 ms 5996 KB Output is correct
14 Correct 24 ms 6124 KB Output is correct
15 Correct 36 ms 7688 KB Output is correct
16 Correct 25 ms 6044 KB Output is correct
17 Correct 25 ms 6124 KB Output is correct
18 Correct 37 ms 7916 KB Output is correct
19 Correct 36 ms 7656 KB Output is correct
20 Correct 25 ms 6124 KB Output is correct
21 Correct 42 ms 8044 KB Output is correct
22 Correct 54 ms 7948 KB Output is correct
23 Correct 54 ms 8044 KB Output is correct
24 Correct 42 ms 7916 KB Output is correct
25 Correct 42 ms 8044 KB Output is correct
26 Correct 55 ms 8072 KB Output is correct
27 Correct 43 ms 8044 KB Output is correct
28 Correct 42 ms 8044 KB Output is correct
29 Correct 45 ms 8112 KB Output is correct
30 Correct 43 ms 8044 KB Output is correct
31 Correct 1 ms 364 KB Output is correct
32 Correct 1 ms 1064 KB Output is correct
33 Incorrect 1 ms 1004 KB Output isn't correct
34 Halted 0 ms 0 KB -