Submission #1008616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1008616		khanhtb	Stove (JOI18_stove)	C++14	100 / 100	20 ms	3100 KiB

stove

#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll,ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const ll mod = 1e9+7;
const ll inf = 1e18;
const ll base = 31;
const ll blocksz = 320;
const ll N = 5e5+8;
ll n,a[N],k;
void solve(){
    cin >> n >> k;
    ll ans = k;
    priority_queue<ll,vi,greater<ll>> pq;
    for(ll i = 1; i <= n; i++){
        cin >> a[i];
        if(i > 1) pq.push(a[i]-a[i-1]);
    }
    while(n > k){
        ans += pq.top();
        pq.pop();
        n--;
    }
    cout << ans;
}
signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen("test.inp","r")){
        freopen("test.inp","r",stdin);
        freopen("test.out","w",stdout);
    }
    ll T = 1;
    // cin >> T;
    while(T--){
        solve();
        // cout << '\n';
    }
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:39:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
stove.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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