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  Hoan_CNTT_VA2_K61  commented on Oct. 25, 2021, 1:06 p.m.

  tham khảo ý tưởng:

  #include<bits/stdc++.h>
  using namespace std;
  int main(){
      int n, k, max=INT_MAX, d;
      cin >> n >> k;
      d = n-k;
      int a[n+5];
      for(int i=0;i<n;i++) cin >> a[i];
      sort(a, a+n);
      for(int i=0;i<k;i++){
          if(a[i+d]-a[i] < max) max = a[i+d]-a[i]; 
      }
      cout << max;
      return 0;
  }