Submission #1255113

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255113		DanielPr8	Feast (NOI19_feast)	C++20	100 / 100	99 ms	9800 KiB

feast

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<ll>;
using vvl = vector<vll>;
using vb = vector<bool>;
using pll = pair<ll,ll>;
using vpl = vector<pll>;
using vvp = vector<vpl>;
#define f first
#define s second
#define pb push_back
#define all(v) v.begin(),v.end()
vll a, rs;
ll n;
pll calc(ll lam){
    vpl dp(n+1);
    pll mx={0,0};
    for(ll i = 1; i<=n; ++i){
        dp[i] = max<pll>(dp[i-1], {mx.f+rs[i]-lam, mx.s-1});
        mx = max<pll>(mx, {dp[i].f-rs[i], dp[i].s});
    }
    return dp[n];
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(NULL);
    ll k;
    cin >> n >> k;
    a = vll(n);
    rs = vll(n+1);
    for(ll i = 0; i < n; ++i){
        cin >> a[i];
        rs[i+1]=rs[i]+a[i];
    }
    ll ans;
    ll s=0, e=1e18;
    while(s<e){
        pll ret = calc((s+e)/2);
        if(-ret.s>k)s=(s+e)/2+1;
        else{ans=ret.f+k*((s+e)/2);e=(s+e)/2;}
    }
    cout << ans;
}

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