제출 #1257346

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1257346		ptgrama	Stove (JOI18_stove)	C++20	100 / 100	12 ms	1864 KiB

stove

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N, K;
    if (!(cin >> N >> K)) return 0;
    vector<long long> T(N);
    for (int i = 0; i < N; ++i) cin >> T[i];

    if (K >= N) {
        cout << N << "\n";
        return 0;
    }

    vector<long long> gaps;
    gaps.reserve(N - 1);
    for (int i = 0; i + 1 < N; ++i) {
        long long g = T[i+1] - T[i] - 1; // jarak dari akhir tamu i ke awal tamu i+1
        // karena "paling banyak satu tamu pada satu waktu", g >= 0
        gaps.push_back(g);
    }

    sort(gaps.begin(), gaps.end()); // naik
    long long extra = 0;
    int needMerge = N - K;
    for (int i = 0; i < needMerge; ++i) extra += gaps[i];

    long long ans = (long long)N + extra;
    cout << ans << "\n";
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50