Submission #1131441

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131441		kem	Stove (JOI18_stove)	C++20	100 / 100	17 ms	1476 KiB

stove

#include <bits/stdc++.h>
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2")
using namespace std;

#define NAME "stove"

#define ll long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define fi first
#define se second
#define endl "\n"

#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()

const int LIM = 2e5 + 3;
const int INF = 1e9 + 9;
const int mod = 1e9 + 7;

int n, k, _t, t;
vector<ll> d;

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    if (ifstream(NAME ".inp"))
    {
        freopen(NAME ".inp", "r", stdin);
        freopen(NAME ".out", "w", stdout);
    }

    cin >> n >> k >> _t;
    for (int i = 1; i < n; i++)
    {
        cin >> t;
        d.pb(t - _t);
        _t = t;
    }
    sort(rall(d));
    ll ans = k--;
    for (auto v : d)
    {
        if (k)
        {
            k--;
            continue;
        }
        ans += v;
    }
    cout << ans;

    return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen(NAME ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(NAME ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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