oj.uz

답안 #848142

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
848142 2023-09-11T12:36:36 Z asd12343 Feast (NOI19_feast) C++14
4 / 100
 25 ms 8856 KB 
#pragma GCC optimize("Os")
#include <bits/stdc++.h>
using namespace std;
const int MN = 2e6+5;
const int INF = 0x3f3f3f3f;
#define int long long
#define pb push_back
#define p make_pair	
#define fi first
#define se second
#define pii pair<int,int>
#define f(i,a,b) for (int i = a ; i < b ; i++)
#define f1(i,a,b) for (int i = a ; i > b ; i--)
#define f2(i,a,b) for (int i = a ; i <= b ; i++)
#define FILE(X)						\
	freopen(#X ".INP","r",stdin);	\
	freopen(#X ".OUT","w",stdout);

mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int random(int l, int r) { return l + rd() % (r - l + 1); }
int a[MN];
int n,k,pos;
int cnt = 0;
int dp[5003][5003];
int pre[MN];
signed main(){
 	ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //FILE(BLUESKY);
    bool flag = false;
    cin >> n >> k;
    for (int i = 1 ; i <= n ; i++) {
    	cin >> a[i];
    	pre[i] = pre[i-1] + a[i];
    	if (a[i] < 0) flag = true,cnt++, pos = i;
    }	
    if (flag == false) cout << accumulate(a+1,a+n+1,0LL);
    else if (cnt == 1) {
    	if (k == 1) {
    		int sum = 0, sum2 = 0;
    		for (int i = 1 ; i < pos ; i++) sum += a[i];
    		for (int i = pos+1 ; i <= n ; i++) sum2 += a[i];
    		cout << max(sum,sum2) << "\n";
    	}
    	else {
    		cout << accumulate(a+1,a+n+1,0LL) - a[pos];
    	}
    }
    else if (cnt == n) cout << 0;
    else if (n <= 5000) {
    	for (int i = 1; i <= k; ++i){
	        int cur = 0;
	        for (int j = 1; j <= n; ++j) {
	            cur = max(cur, dp[i-1][j] - pre[j]);
	            dp[i][j] = max(dp[i][j-1], cur + pre[j]);
	        }
    	}
    	int ans = 0;
    	for (int i = 0 ; i <= k ; i++) ans = max(ans,dp[n][i]);
    	cout << ans <<"\n";
    }
    return 0;
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 8792 KB Output is correct
2 Correct 22 ms 8848 KB Output is correct
3 Correct 24 ms 8856 KB Output is correct
4 Correct 23 ms 8852 KB Output is correct
5 Correct 24 ms 8784 KB Output is correct
6 Correct 22 ms 8580 KB Output is correct
7 Correct 23 ms 8588 KB Output is correct
8 Correct 25 ms 8828 KB Output is correct
9 Correct 22 ms 8588 KB Output is correct
10 Correct 23 ms 8796 KB Output is correct

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 8796 KB Output is correct
2 Incorrect 15 ms 8852 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 24 ms 8852 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 2396 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 8792 KB Output is correct
2 Correct 22 ms 8848 KB Output is correct
3 Correct 24 ms 8856 KB Output is correct
4 Correct 23 ms 8852 KB Output is correct
5 Correct 24 ms 8784 KB Output is correct
6 Correct 22 ms 8580 KB Output is correct
7 Correct 23 ms 8588 KB Output is correct
8 Correct 25 ms 8828 KB Output is correct
9 Correct 22 ms 8588 KB Output is correct
10 Correct 23 ms 8796 KB Output is correct
11 Correct 15 ms 8796 KB Output is correct
12 Incorrect 15 ms 8852 KB Output isn't correct
13 Halted 0 ms 0 KB -