Submission #1241433

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241433		tminh	Stove (JOI18_stove)	C++20	100 / 100	12 ms	1480 KiB

stove

/*
	Em la may troi trong gio
	Anh la cay nhieu dan do
*/

#include "bits/stdc++.h"
using namespace std;

#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>


#define ep emplace_back
#define pb push_back
#define pf push_front


const int mod = 1e9 + 7;
const signed N = 1e6 + 5;
const ll oo = 1e18;

int n, k, t[N];
vector<int> arr;

void output() {
	int total = (t[n] - t[1] + 1);
	for (int i = 2; i <= n; ++i) arr.pb(t[i] - (t[i - 1] + 1));
	sort(vall(arr), greater<int>());
	for (int i = 0; i < k; ++i) total -= arr[i];
	cout << total;
    return;
}

void input() {
	cin >> n >> k;
	for (int i = 1; i <= n; ++i) cin >> t[i];
	--k;
    output();
    return;
}

signed main() {
    if(fopen("", "r")) {
        freopen("", "r", stdin);
        freopen("", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen("", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~
stove.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen("", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~

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