Submission #1255295

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255295		mountainsalt	Feast (NOI19_feast)	C++20	59 / 100	66 ms	9800 KiB

feast

#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int N = 3e5 + 5;

ll n, k, a[N], p[N];

pair <ll, ll> solve(ll lmb){
    pair <ll, ll> mx = {0, 0};
    vector <pair <ll, ll>> dp(n + 1);
    for (int i = 1; i <= n; i++) {
        dp[i] = max(dp[i - 1], {mx.first + p[i] - lmb, mx.second + 1});
        mx = max(mx, {dp[i].first - p[i], dp[i].second});
    }
    return dp[n];
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        p[i] = p[i - 1] + a[i];
    }
    ll l = 0, r = 1e18, ans = 0;
    while (l <= r) {
        ll mid = l + (r - l) / 2;
        pair <ll, ll> cur = solve(mid);
        if (cur.second > k) l = mid + 1;
        else r = mid - 1, ans = mid;
    }
    cout << solve(ans).first + k * ans;
}

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