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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- map<ll,ll>a;
- map<ll,ll>::iterator it;
- ll c,d,e,f,i,j=0,k,l;
- cin>>c;
- for(i=0;i<c;i++)
- {
- cin>>d;
- a[d]++;
- a[d-1]++;
- a[d+1]++;
- }
- for(it=a.begin();it!=a.end();it++)
- {
- j=max(j,it->second);
- }
- cout<<j<<endl;
- return 0;
- }
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