Submission #1268594

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268594		duyanhloveav	Stove (JOI18_stove)	C++20	100 / 100	13 ms	2380 KiB

stove

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

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1LL)

using ll = long long;

const int mxn = 9 + 1e6;
const int inf = 0x3f3f3f3f;
const ll lnf = 0x3f3f3f3f3f3f3f3f;

#define int long long

void _27augain(void) {
  int n, k;
  cin >> n >> k;
  vector<int> a(n);
  for (auto &x : a) {
    cin >> x;
  }
  vector<int> d;
  for (int i = 1; i < n; ++i) {
    d.push_back(a[i] - a[i - 1] - 1);
  }
  int s = a[n - 1] + 1 - a[0];
  sort(rbegin(d), rend(d));
  for (int i = 0; i < k - 1; ++i) {
    s -= d[i];
  }
  cout << s << "\n";
}

int32_t main(void) {
#define task "_27augain"
  cin.tie(0)->sync_with_stdio(0);
  for (string iext : {"in", "inp"}) {
    if (fopen((task "." + iext).c_str(), "r")) {
      freopen((task "." + iext).c_str(), "r", stdin);
      freopen(task ".out", "w", stdout);
    }
  }
  int testcase = 1;
  // cin >> testcase;
  while (testcase--) {
    _27augain();
  }
  return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int32_t main()':
stove.cpp:39:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |       freopen((task "." + iext).c_str(), "r", stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:40:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |       freopen(task ".out", "w", stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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