Submission #713979

#	Time	Username	Problem	Language	Result	Execution time	Memory
713979		epicci23	Stove (JOI18_stove)	C++17	100 / 100	59 ms	9080 KiB

stove

#include "bits/stdc++.h"
#pragma optimize ("Bismillahirrahmanirrahim")
using namespace std;
#define pb push_back
#define ff first
#define ss second
#define endl "\n" 
#define int long long
#define double long double
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define what_is(x) cerr << #x << " is " << x << endl;
//#define m (l+r)/2
constexpr int N=200005;
constexpr int MOD=1000000007;
constexpr int  INF2 = LLONG_MAX;
constexpr int INF=(int)1e18;
constexpr int LOG=30;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
typedef priority_queue<pii,vector<pii>,greater<pii>> min_pq;
typedef priority_queue<pii> max_pq;
typedef long long ll;
//to think//
/*
 * graph approach
 * dp
 * dividing the problem to smaller statements
 * finding the real constraint
 * sqrt decomposition
 * greedy approach
 * pigeonhole principle
 * rewriting the problem/equality 
 * bitwise approaches
 * binary search if monotonic
 * divide and conquer
 * combinatorics
 * inclusion - exclusion
 * think like bfs
*/



inline int in()
{
  int x;cin >> x;
  return x;
}

inline string in2()
{
  string x;cin >> x;
  return x;
}


void solve()
{
  int n=in(),k=in();

  set<pii> s;

  vector<int> mark(n+2,0);

  int arr[n+1];
  for(int i=1;i<=n;i++) arr[i]=in();

  for(int i=1;i<n;i++)
  {
    if(arr[i]+1<arr[i+1]) s.insert({arr[i+1]-arr[i]-1,i});
  }
  int kac=k-1;
  while(!s.empty() && kac)
  {
    mark[(*s.rbegin()).ss]=1;
    s.erase(*s.rbegin());
    kac--;
  }
  int last=arr[1],ans=0;
  for(int i=1;i<n;i++)
  {
    if(mark[i]==1)
    {
      ans+=arr[i]+1-last;
      last=arr[i+1];
    }
  }
  ans+=arr[n]+1-last;
  cout << ans << endl;
}

int32_t main(){
   

     cin.tie(0); ios::sync_with_stdio(0);
     cout << fixed <<  setprecision(15);
   
   int t=1;//cin>> t;
 
 for(int i=1;i<=t;i++)
 {
  //  cout << "Case #" << i << ": ";
    solve();
 }
 
 return 0;
}

Compilation message (stderr)

stove.cpp:2: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    2 | #pragma optimize ("Bismillahirrahmanirrahim")
      |

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