Submission #1594697

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double 
#define vpi vector<pair <int, int> >
#define vi vector<int>
#define vl vector<ll>
#define vpl vector<pair<ll, ll> >
#define pb push_back
#define mp make_pair
#define all(p) (p).begin(), (p).end()
#define fi first
#define se second
#define mem(a) memset((a), 0 , sizeof((a)))
#define mod 1e9+7
#define inf 100000000007
#define N 1000005
int isp[N] = {};

int main(){
	ios_base::sync_with_stdio(NULL),cin.tie(NULL),cout.tie(NULL);
	int n, ma=0, a;
	mem(isp);
	cin >> n;
	for (int i = 0; i < n; ++i) {
		cin >> a;
		isp[a]++;
		ma = max(ma, a);
	}

	// for(int i=0;i<=ma;++i){
	// 	cout<<"isp["<<i<<"] : "<<isp[i]<<"\n";
	// }

	int ans = 0;
	for (int i = 0; i <= ma-2; ++i) {
		ans = max(ans, (isp[i] + isp[i+1] + isp[i+2]));
		//cout<<ans<<"\n";
	}
	cout << ans << "\n";

	return 0;
}

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