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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. #define ll long long
  5. #define endl "\n"
  6. #define FOR(i, a, b) for (int i = a; i <= b; i++)
  7. #define FORD(i, a, b) for (int i = a; i > b; i--)
  8. #define FORu(i, a, b) for (int i = a; i < b; i++)
  9. #define vii vector <int> 
  10. #define pb push_back
  11. #define fi first
  12. #define se second
  13. #define sz(a) (int)a.size()
  14. #define all(x) x.begin(), x.end()
  15. #define filei "BAI5.INP"
  16. #define fileo "BAI5.out"
  17. int main()
  18. {
  19.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  20.     if (fopen(filei, "r"))
  21.     {
  22.         freopen(filei, "r", stdin);
  23.         freopen(fileo, "w", stdout);
  24.     }
  25.     ll n, cnt = 0; cin >> n;
  26.     vector <ll> a;
  27.     FORu(i, 0, n)
  28.     {
  29.     	ll x; cin >> x;
  30.     	if (x == 0) cnt++;
  31.     	else a.pb(x);
  32.     }
  33.     sort(a.begin(), a.end());
  34.     ll max_len = 0;
  35.     FORu(i, 0, sz(a))
  36.     {
  37.     	ll j = i;
  38.     	while (j + 1 < sz(a) && a[j + 1] == a[j] + 1)
  39.     	{
  40.     		j++;
  41.     	}
  42.     	max_len = max(max_len, j - i + 1 + cnt);
  43.     	i = j;
  44.     }
  45.     cout << max_len;
  46.  
  47.  
  48.  
  49.  
  50. }
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin 
7
1 0 3 8 5 9 0
stdout 
4
https://ideone.com/OzT1oz
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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