Submission #465333

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
465333	2021-08-15 15:14:56	dattranxxx	Stove (JOI18_stove)	C++11	50 / 100	1 ms	460 KiB

stove

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/*
 * Author :  shora
 */
#include <bits/stdc++.h>
#define print(_v) for (auto &_ : _v) {cerr << _ << ' ';} cerr << endl;
using namespace std;
using ll = long long;
const int oo = 1e9;
const int N = 5000;
int a[N], b[N-1];
int n, k;
int main() {
  cin.tie(0)->sync_with_stdio(0); cout.tie(0);
  cin >> n >> k;
  for (int i = 0; i < n; ++i)
    cin >> a[i];
  for (int i = 0; i < n-1; ++i)
    b[i] = a[i] - a[i+1] + 1;
  sort(b, b + n - 1);
  int res = a[n-1]-a[0]+1;
  // a[n-1]-a[0]+1 => a[n-1]-a[m+1]+1 + a[m]-a[0]+1 = a[n-1]-a[0]+1 + a[m]-a[m+1]+1
  for (int i = 0; i < k-1; ++i)
    res += b[i];
  cout << res;
  return 0;
}
 
 
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• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50