Submission #1026012

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026012		ach00	Feast (NOI19_feast)	C++14	100 / 100	98 ms	5736 KiB

feast

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define MP make_pair
#define EPS 0.00001
int n,k;
vector<ll> W;
pair<ll,ll> solve(ll pen) {
    pair<ll,ll> zero = {0,0};
    pair<ll,ll> one = {W[0] - pen, 1};
    for(int i = 1; i < n; i++) {
        pair<ll,ll> _zero, _one;
        _zero = max(zero, one);
        _one = max(MP(one.first + W[i], one.second), MP(zero.first + W[i] - pen, zero.second + 1));
        zero = _zero;
        one = _one;
    }
    return max(zero, one);
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> k;
    ll lower = 0;
    ll upper = 10000000000000;
    W.resize(n); for(auto &a : W) cin >> a;
    while(lower < upper) {
        ll m = (lower+upper+1)/2;
        auto K = solve(m);
        if(K.second >= k) {
            lower = m;
        } else {
            upper = m-1;
        }
    }
    auto K = solve(lower);
    cout << K.first + k*lower;
}

• 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