Submission #1176519

#	Time	Username	Problem	Language	Result	Execution time	Memory
1176519		dosts	Feast (NOI19_feast)	C++20	0 / 100	157 ms	12100 KiB

feast

#include <bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define sp << " " << 
using namespace std;

const int N = 1e4+1,MOD = 1e9+7,inf = 2e9;


void solve() {
    int n,k;
    cin >> n >> k;
    vi a(n+1);
    for (int i=1;i<=n;i++) cin >> a[i];
    //maximal penalty such that taker >= k
    auto k_loose = [&](int lamb) -> pii {
        pii dp[n+1][2];
        for (int i = 0;i<=n;i++) for (int j = 0;j<2;j++) dp[i][j] = {-inf,-inf};
        dp[0][0] = {0,0};
        for (int i=1;i<=n;i++) {
            //ya yeni açıcam ya almicam ya devam ettircem
            dp[i][0] = max(dp[i-1][0],dp[i-1][1]);
            dp[i][1] = max(dp[i][1],max(pii{dp[i-1][1].ff+a[i],dp[i-1][1].ss},pii{dp[i-1][0].ff+a[i]-lamb,dp[i-1][0].ss+1}));
        }
        return max(dp[n][0],dp[n][1]);
    };
    int l = 0;
    int r = 1e18;
    while (l<=r) {
        int m = (l+r) >> 1;
        pii res = k_loose(m);
        if (res.ss >= k) l = m+1;
        else r = m-1;
    }
    pii res = k_loose(r);
    cout << max(0ll,res.ff+r*k) << '\n';
};

signed main() {
    ios_base::sync_with_stdio(0);cin.tie(0);
    #ifdef Dodi
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
} 

• Subtask 1: 0 / 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