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a guest Aug 25th, 2019 69 Never
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  1. #include<stdio.h>
  2. int main()
  3. {
  4.     int n;
  5.     scanf("%d",&n);
  6.     int arr[n];
  7.     for(int i=0;i<n;i++)
  8.         scanf("%d",&arr[i]);
  9.     int flag;
  10.     do
  11.     {
  12.         flag=0;
  13.         for(int i=0;i<n-1;i++)
  14.         {
  15.             if(arr[i]>arr[i+1])
  16.             {
  17.                 arr[i] = arr[i]+arr[i+1];
  18.                 arr[i+1]= arr[i]-arr[i+1];
  19.                 arr[i] = arr[i]-arr[i+1];
  20.                 flag = 1;
  21.             }
  22.         }
  23.     }while(flag!=0);
  24.     flag = arr[0];
  25.     for(int i=0;i<n;i++)
  26.     {
  27.         if(arr[i]==flag)
  28.             flag++;
  29.     }
  30.     if(flag==(arr[n-1]+1))
  31.         printf("YES");
  32.     else
  33.         printf("NO");
  34. }
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