Submission #684578

#	Time	Username	Problem	Language	Result	Execution time	Memory
684578		pragmatist	Stove (JOI18_stove)	C++17	100 / 100	22 ms	2296 KiB

stove

/*
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("O3")
#pragma GCC target ("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize("unroll-loops")
*/
 
#include<bits/stdc++.h>
 
#define sz(v) (int)v.size()
#define ll long long
#define pb push_back
#define x first
#define y second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define nl "\n"
 
using namespace std;
using pii = pair<int, int>;
 
const int N = (int)1e5 + 7; // make sure this is right
const int M = (int)1e6 + 7;
const int inf = (int)1e9 + 7;
const ll INF = (ll)3e18 + 7; 
const ll MOD = (ll)998244353; // make sure this is right
 
bool bit(int x, int i) {
	return x >> i & 1;
}
 
pii dir[] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};

int n, k, a[N];
 
void solve() {
	cin >> n >> k;
	for(int i = 1; i <= n; ++i) {
		cin >> a[i];
	}
	int ans = a[n] - a[1];
	vector<int> v;
	for(int i = 2; i <= n; ++i) v.pb(a[i] - a[i - 1]);
	sort(rall(v));
	for(int i = 0; i < k - 1; ++i) ans -= v[i];
	cout << ans + k;
}
 
signed main() {	
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
	int test = 1;
	//cin >> test;
	for(int i = 1; i <= test; ++i) {
	 	//cout << "Case #" << i << ": ";
		solve();
	}
	return 0;
}

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