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- #include <bits/stdc++.h>
- using namespace std;
- bool illuminati[1000];
- int main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(NULL);
- int n,m,k,cont=0,tot=0;
- cin>>n>>m>>k;
- int lampioni[m];
- for(int i = 0 ; i < m ; i++ )
- {
- cin>>lampioni[i];
- }
- for(int i = 0 ; i < m ; i++ )
- {
- for(int j = (lampioni[i]-1)+k ; j>=(lampioni[i]-1)-k; j--){
- if(j==0){
- illuminati[j]=true;
- break;
- }else{
- illuminati[j]=true;
- }
- }
- }
- k=k*2+1;
- int i=0;
- while(i<n){
- cont=0;
- while(illuminati[i]==false&&i<n){
- cont++;
- i++;
- }
- if(cont>0){
- if(cont%k==0){
- tot+=cont/k;
- }else{
- tot+=((cont/k)+1);
- }
- }
- while(illuminati[i]==true&&i<n){
- i++;
- }
- }
- cout<<tot;
- }
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