Submission #1109991

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109991		NoMercy	Feast (NOI19_feast)	C++17	4 / 100	121 ms	26616 KiB

feast

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

int32_t main () {

    ios_base::sync_with_stdio(0); 
    cin.tie(0); 
    cout.tie(0); 

    int N, K;
    cin >> N >> K;
    vector<ll> arr(N + 1, 0);
    for (int i = 1;i <= N;i ++) cin >> arr[i];

    vector<vector<array<ll, 2>>> dp(N + 1, {{0, 0}, {0, 0}});
    ll lo = 0, hi = 1e16 + 6789;
    while (lo + 1 < hi) {
        ll mid = (lo + hi) / 2LL;
        for (int i = 1;i <= N;i ++) {
            if ((dp[i - 1][0][0] == dp[i - 1][1][0] && dp[i - 1][0][1] > dp[i - 1][1][1]) || (dp[i - 1][0][0] > dp[i - 1][1][0])) {
                dp[i][0] = {dp[i - 1][0][0], dp[i - 1][0][1]};
            } else {
                dp[i][0] = {dp[i - 1][1][0], dp[i - 1][1][1]};
            }
            if ((dp[i - 1][0][0] + arr[i] - mid == dp[i - 1][1][0] + arr[i] && dp[i - 1][0][1] + 1 > dp[i - 1][1][1]) || (dp[i - 1][0][0] + arr[i] - mid > dp[i - 1][1][0] + arr[i])) {
                dp[i][1] = {dp[i - 1][0][0] + arr[i] - mid, dp[i - 1][0][1] + 1};
            } else {
                dp[i][1] = {dp[i - 1][1][0] + arr[i], dp[i - 1][1][1]};
            }
        }
        if (max(dp[N][0][1], dp[N][1][1]) <= K) {
            hi = mid;
        } else {
            lo = mid;
        }
    }
    for (int i = 1;i <= N;i ++) {
        if ((dp[i - 1][0][0] == dp[i - 1][1][0] && dp[i - 1][0][1] > dp[i - 1][1][1]) || (dp[i - 1][0][0] > dp[i - 1][1][0])) {
            dp[i][0] = {dp[i - 1][0][0], dp[i - 1][0][1]};
        } else {
            dp[i][0] = {dp[i - 1][1][0], dp[i - 1][1][1]};
        }
        if ((dp[i - 1][0][0] + arr[i] - lo == dp[i - 1][1][0] + arr[i] && dp[i - 1][0][1] + 1 > dp[i - 1][1][1]) || (dp[i - 1][0][0] + arr[i] - lo > dp[i - 1][1][0] + arr[i])) {
            dp[i][1] = {dp[i - 1][0][0] + arr[i] - lo, dp[i - 1][0][1] + 1};
        } else {
            dp[i][1] = {dp[i - 1][1][0] + arr[i], dp[i - 1][1][1]};
        }
    }
    cout << max(dp[N][0][0], dp[N][1][0]) << "\n";
}

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