Submission #831322

#	Time	Username	Problem	Language	Result	Execution time	Memory
831322		manhtuan22007	Stove (JOI18_stove)	C++14	100 / 100	18 ms	3240 KiB

stove

#include <bits/stdc++.h>
#define int long long
#define ll long long
using namespace std;

const int maxn = 1e5 + 10;

int n , k , a[maxn];

int32_t main()
{
	cin.tie(0)->sync_with_stdio(0);
	if(fopen(".inp" , "r")){
		freopen(".inp" , "r" , stdin);
		freopen(".out" , "w" , stdout);
	}
	cin >> n >> k;
	for(int i = 1 ; i <= n ; i ++) cin >> a[i];
	vector<int> v;
	for(int i = 2 ; i <= n ; i ++){
		v.push_back(a[i] - a[i - 1] - 1);
	}
	sort(v.begin() , v.end());
	int res = a[n] - a[1] + 1;
	for(int i = n - 2 ; i >= n - k ; i --){
		res -= v[i];
	}
	cout << res;
}	

Compilation message (stderr)

stove.cpp: In function 'int32_t main()':
stove.cpp:14:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |   freopen(".inp" , "r" , stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stove.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   freopen(".out" , "w" , stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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