Submission #1128299

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128299		mingga	Stove (JOI18_stove)	C++20	100 / 100	16 ms	1988 KiB

stove

#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define int long long
const int MOD = 1e9 + 7;
const int inf = 2e18;
const int N = 1e5 + 7;
int n, k, a[N];

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	cin >> n >> k;
	vector<int> vec;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
		if(i > 1) vec.pb(a[i - 1] - a[i]);
	}
	sort(all(vec));
	int ans = a[n] - a[1] + k;
	for(int i = 0; i < k - 1; i++) {
		ans += vec[i];
	}
	cout << ans << ln;
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

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