Submission #1033669

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033669		vjudge1	Stove (JOI18_stove)	C++17	100 / 100	25 ms	2392 KiB

stove

// #pragma GCC optimize("O3,Ofast,unroll-loops")
// #pragma GCC targt("arch=skylake,avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long 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 = 2e18;
const ll blocksz = 320;
const ll N = 2e5 + 8;
ll n,a[N],k;
void solve(){
    cin >> n >> k;
    ll ans = k;
    for(ll i = 1; i <= n; i++){
        cin >> a[i];
    }
    priority_queue<ll,vi,greater<ll>> pq;
    for(ll i = 2; i <= n; i++) pq.push(a[i]-a[i-1]);
    while(pq.size() && 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;
    for (ll i = 1; i <= T; i++){
        solve();
        cout << '\n';
    }
}

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:43:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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