Submission #790253

#	Time	Username	Problem	Language	Result	Execution time	Memory
790253		n3rm1n	Stove (JOI18_stove)	C++17	100 / 100	15 ms	2260 KiB

stove

#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const long long MAXN = 1e5 + 10;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

long long n, k, a[MAXN];

void read()
{
    cin >> n >> k;
    for (long long i = 1; i <= n; ++ i)
        cin >> a[i];
}

void solve()
{
    vector < long long > g;
    long long ans = a[n] - a[1] + 1;
    for (long long i = 2; i <= n; ++ i)
    {
        g.push_back(- (a[i] - a[i-1] - 1));
    }
    sort(g.begin(), g.end());
    long long i = 0;
    while(i < k-1)
    {
        ans += g[i];
        i ++;
    }
    cout << ans << endl;
}

int main()
{
    speed();

    read();
    solve();
    return 0;
}

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