Submission #1287676

#	Time	Username	Problem	Language	Result	Execution time	Memory
1287676		quan606303	Stove (JOI18_stove)	C++20	100 / 100	21 ms	2408 KiB

stove

/*
 * @Author: RMQuan 
 * @Date: 2025-11-05 09:33:52 
 * @Last Modified by: RMQuan
 * @Last Modified time: 2025-11-05 09:39:06
 */
/*idea : 



*/
#include <bits/stdc++.h>
bool M1;
#define int long long
#define ll long long
#define INTMAX INT_MAX
#define INTMIN INT_MIN
#define LONGMAX LLONG_MAX
#define LONGMIN LLONG_MIN
#define fi first
#define se second
#define memfull(a,b) memset(a,b,sizeof(a));
#define endl '\n'
#define TASK "TEST"
#define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
using namespace std;
const int MOD=1e9+7;
const int maxn=1e5+7;
int n,k,a[maxn];
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    file();
    cin>>n>>k;
    for (int i=1;i<=n;i++)cin>>a[i];
    sort(a+1,a+1+n);
    vector<int> vt;
    for (int i=1;i<n;i++)vt.push_back(a[i+1]-a[i]);
    sort(vt.begin(),vt.end());
    if (n<=k)cout<<n<<endl;
    else{
        int ans=n;
        for (int i=1;i<=n-k;i++)ans+=(vt[i-1]-1);
        cout<<ans;
    }
    bool M2;
    cerr<<"-------------------------------------------------"<<endl;
    cerr<<"Time : "<<clock()<<" ms"<<endl;
    cerr<<"Memory : "<<abs(&M2-&M1)/1024/1024<<" MB"<<endl;
    cerr<<"-------------------------------------------------"<<endl;
    return 0;
}

Compilation message (stderr)

stove.cpp: In function 'int32_t main()':
stove.cpp:25:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 | #define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
      |                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stove.cpp:35:5: note: in expansion of macro 'file'
   35 |     file();
      |     ^~~~
stove.cpp:25:81: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 | #define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
      |                                                                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:35:5: note: in expansion of macro 'file'
   35 |     file();
      |     ^~~~

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