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- #include <iostream>
- #include <cstring>
- using namespace std;
- int main()
- {
- int n,m,k;
- cin>>n>>m>>k;
- bool edostapno[2][5010];
- memset(edostapno,true,10002);
- for(int i=0;i<k;i++)
- {
- int temp;
- cin>>temp;
- int strana=temp%2;
- temp/=2;
- if(strana==0)
- temp--;
- for(int j=max(0,temp-m);j<=min(5001,temp+m);j++)
- edostapno[strana][j]=0;
- }
- int dodadeni=0;
- for(int i=0;i<n/2;i++)
- {
- if(edostapno[0][i])
- {
- dodadeni++;
- for(int j=i;j<=min(5001,i+m);j++)
- edostapno[0][j]=false;
- }
- }
- for(int i=0;i<n/2+n%2;i++)
- {
- if(edostapno[1][i])
- {
- dodadeni++;
- for(int j=i;j<=min(5001,i+m);j++)
- edostapno[1][j]=false;
- }
- }
- cout<<dodadeni;
- return 0;
- }
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