Submission #1228919

#	Time	Username	Problem	Language	Result	Execution time	Memory
1228919		Hduong	Stove (JOI18_stove)	C++20	100 / 100	13 ms	1988 KiB

stove

#include <bits/stdc++.h>
#define task "task"

using namespace std;
const long long INF = 1e18;
const int N = 1e5 + 5;
long long a[N], n, k, b[N], s = 0;

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

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

  cin >> n >> k;
  for (int i = 1; i <= n; i++) cin >> a[i];
  long long res = a[n] - a[1] + 1;

  for (int i = 1; i < n; i++) {
    b[++s] = a[i + 1] - a[i] - 1;
  }
//  cout << s << " ";
  sort(b + 1, b + s + 1, greater <long long>());
  for (int i = 1; i < k; i++) res -= b[i];
  cout << res;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:14:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen (task".inp", "r", stdin);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:15:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen (task".out", "w", stdout);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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