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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- int a[200000]={0},c[200000],d,e=0,f=0,i,j,k,l;
- cin>>d;
- for(i=0;i<d;i++)
- {
- cin>>c[i];
- a[c[i]]++;
- f=max(f,c[i]);
- }
- for(i=1;i<=f+5;i++)
- {
- if(a[i-1])
- {
- a[i-1]--;
- e++;
- }
- else if(a[i])
- {
- a[i]--;
- e++;
- }
- else if(a[i+1])
- {
- a[i+1]--;
- e++;
- }
- }
- cout<<e<<endl;
- return 0;
- }
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