Submission #1270961

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270961		nthvn	Stove (JOI18_stove)	C++20	100 / 100	13 ms	1096 KiB

stove

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

#define fi first
#define se second
#define pii pair<int,int>
#define ll long long
#define pb(x) push_back(x)
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
const int N= 1e5+5;
int n,k;
int a[N], d[N];

signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    if(fopen("STOVE.INP", "r")){
        freopen("STOVE.INP", "r", stdin);
        freopen("STOVE.OUT", "w", stdout);
    }
    cin>>n>>k;
    for(int i=1;i<=n;i++) cin>>a[i];
    for(int i=1;i<n;i++) d[i] = a[i]-a[i+1];

    sort(d+1,d+n);
    ll ans = 0;
    for(int i=1;i<=k-1;i++) ans+= d[i];
    ans+= -a[1] + a[n]+k;
    cout<<ans;
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("STOVE.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("STOVE.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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