fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int n;
  5. int a[100005];
  6. int slxh[100005]; /// slxh[t] = x có ý nghĩa là giá trị t được xuất hiện x lần
  7. int dd = 1;
  8.  
  9. int main()
  10. {
  11.     cin >> n;
  12.     for(int i = 1;i <= n;i++)
  13.     {
  14.         cin >> a[i];
  15.     }
  16.  
  17.     for(int i = 1;i <= n;i++)
  18.     {
  19.         slxh[i] = 0;
  20.     }
  21.  
  22.     for(int i = 1;i <= n;i++)
  23.     {
  24.         int t = a[i];
  25.         if(t < 1 || t > n)
  26.         {
  27.             cout <<"NO";
  28.             return 0;
  29.         }
  30.         slxh[t]++;
  31.     }
  32.  
  33.     for(int i = 1;i <= n;i++)
  34.     {
  35.         if(slxh[i] != 1)
  36.         {
  37.             dd = 0;
  38.             break;
  39.         }
  40.     }
  41.  
  42.     if(dd == 0)
  43.     {
  44.         cout <<"NO";
  45.     }
  46.     else cout <<"YES";
  47. }
Success #stdin #stdout 0.01s 5316KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
YES
https://ideone.com/jF7Lwu
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!