Submission #1025801

#	Time	Username	Problem	Language	Result	Execution time	Memory
1025801		ach00	Feast (NOI19_feast)	C++14	100 / 100	854 ms	24188 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) {
    vector<vector<pair<ll,ll>>> dp(300005, vector<pair<ll,ll>>(2));
    dp[0][0] = {0, 0};
    dp[0][1] = {W[0] - pen, 1};
    for(int i = 1; i < n; i++) {
        dp[i][0] = max(dp[i-1][0], dp[i-1][1]);
        dp[i][1] = max(MP(dp[i-1][1].first + W[i], dp[i-1][1].second), MP(dp[i-1][0].first + W[i] - pen, dp[i-1][0].second + 1));
    }
    return max(dp[n-1][0], dp[n-1][1]);
}

int main() {
    cin >> n >> k;
    ll lower = 0;
    ll upper = 1000000000000000;
    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