Submission #791558

#	Time	Username	Problem	Language	Result	Execution time	Memory
791558		cheat_when_I_was_young	Feast (NOI19_feast)	C++17	51 / 100	1025 ms	11176 KiB

feast

// #cheat_when_we_are_young
// #cheatkhitacontre #khionhatoicheat
// #thaycuckythatvong
#include<bits/stdc++.h>
using namespace std;
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define int long long
using namespace std;
const int NM = 2005, MN = 3e5 + 5;
int n, k, a[MN], dp[NM][NM];
void sub1() {
    for (int i = 1; i <= n; ++i) a[i] += a[i-1];
    cout << a[n];
}
void sub2() {
    int ans = 0;
    for (int i = 1; i <= n; ++i) if (a[i] >= 0) ans += a[i];
    cout << ans;
}
void sub3() {
    int minprefix = 0, ans = 0;
    for (int i = 1; i <= n; ++i) {
        a[i] += a[i-1];
        minprefix = min(minprefix, a[i]);
        ans = max(ans, a[i] - minprefix);
    }
    cout << ans;
}
void nnk() {
    for (int i = 1; i <= n; ++i) a[i] += a[i-1];
    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]);
        for (int p = 1; p <= i; ++p) dp[i][j] = max(dp[i][j], dp[p-1][j-1] + a[i] - a[p-1]);
    }
    cout << dp[n][k];
}
signed main() {
	IOS;
    cin >> n >> k;
    int check = 0;
    for (int i = 1; i <= n; ++i) {
        cin >> a[i];
        if (a[i] < 0) ++check;
    }
    if (check == 0) {
        sub1();
        return 0;
    }
    if (k == 1) {
        sub3();
        return 0;
    }
    if (check == 1) {
        sub2();
        return 0;
    }
    nnk();
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 0 / 20
• Subtask 7: 0 / 29