Submission #678053

#	Time	Username	Problem	Language	Result	Execution time	Memory
678053		vjudge1	Stove (JOI18_stove)	C++17	0 / 100	1 ms	256 KiB

stove

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define sz(x) (x).size() 
#define all(x) (x).begin(), (x).end()
 
using namespace std;
 
string alphabet = "abcdefghijklmnopqrstuvwxyz";

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n,k;
    cin >> n >> k;

    vector <ll> a(n),pref(n - 1);

    for(int i = 0; i < n; i++)
    {
        cin >> a[i];

        if(i != 0)
        {
            pref[i - 1] = a[i] - a[i - 1];
        }
    }

    if(k == 1)
    {
        cout << (a[n - 1] - a[0]) + 1;
    }
    else if(n == k) 
    {
        cout << n;
    }
    else 
    {
        ll sum = 0;

        sort(all(pref));

        reverse(all(pref));

        if(n - k == 1)
        {
            cout << pref[0] + 1;
            return 0;
        }

        for(int i = 0; i < k - 1; i++)
        {
            sum += pref[i];
        }

        cout << sum;
    }
    

    return 0;
}

/*
    
*/

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50