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  1. #include<bits/stdc++.h>
  2. #define ll long long 
  3. #define mp make_pair 
  4. #define f(i,n) for(int i=0;i<n;i++) 
  5. #define F first 
  6. #define S second 
  7. #define pb push_back 
  8.  
  9. using namespace std;
  10.  
  11. void test(){
  12. 	ll n,m;
  13. 	cin>>n>>m;
  14.  
  15. 	if(m==0){
  16. 		cout<<"1\n";
  17. 		return ;
  18. 	}
  19.  
  20. 	vector<ll> a(m);
  21. 	f(i,m)cin>>a[i];
  22. 	sort(a.begin(),a.end());
  23. 	if(a[m-1]!=n)a.pb(n+1);
  24. 	if(a[0]!=1)a.pb(0);
  25. 	sort(a.begin(),a.end());
  26.  
  27. 	vector<ll> v;
  28.  
  29. 	f(i,a.size()-1){
  30. 		if(a[i+1]-a[i]-1!=0)
  31. 			v.pb(a[i+1]-a[i]-1);
  32. 	}
  33. 	if(v.size()==0){
  34. 		cout<<"0\n";
  35. 		return ;
  36. 	}
  37. 	sort(v.begin(),v.end());
  38.  
  39. 	ll dif = v[0];
  40. 	ll res = 0;
  41. 	f(i,v.size()){
  42. 		res = res + (v[i]/dif);
  43. 		if(v[i]%dif!=0)res++;
  44. 	}
  45. 	cout<<res<<"\n";
  46.  
  47. }
  48.  
  49. int main(){
  50. 	std::ios::sync_with_stdio(false);
  51. 	cin.tie(0);
  52. 	cout.tie(0);
  53. 	int tests=1;
  54. 	// cin>>tests;
  55. 	while(tests--){
  56. 		test();
  57. 	}
  58. }
  59.  
Success #stdin #stdout 0s 5008KB
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https://ideone.com/ves0CJ
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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