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  1. program walkway;
  2. const MAXN=1000000;
  3. type elenco=array[0..MAXN] of Longint;
  4. var N,K,i:Longint;
  5.     H : elenco;
  6.  
  7.  
  8. Procedure scambia (var a,b: Longint);
  9. var x:Longint;
  10. begin
  11.    x:=a;
  12.    a:=b;
  13.    b:=x;
  14. end;  
  15. Procedure ordinamento (estremoi,estremos: Longint; var v : elenco; ordinato:boolean);
  16. var inf, sup, medio:Longint;
  17.     pivot :Longint;
  18. begin
  19.     inf:=estremoi;
  20.     sup:=estremos;
  21.     medio:= (estremoi+estremos) div 2;
  22.     pivot:=v[medio];
  23.     repeat
  24.       if (ordinato) then
  25.          begin
  26.             while (v[inf]<pivot) do  inf:=inf+1;
  27.             while (v[sup]>pivot) do  sup:=sup-1;
  28.          end;
  29.       if inf<=sup then
  30.        begin
  31.          scambia(v[inf],v[sup]);
  32.          inf:=inf+1;
  33.          sup:=sup-1;
  34.        end;
  35.     until inf>sup;
  36.     if (estremoi<sup) then ordinamento(estremoi,sup,v,ordinato);
  37.     if (inf<estremos) then ordinamento(inf,estremos,v,ordinato);
  38. end;
  39.  
  40. function spread(N, K: longint; var H: elenco): longint;
  41. var w, diff, mindiff:Longint;
  42.  
  43. begin
  44.     w:=0; mindiff:=1000005;
  45.     while w<N-K+1 do
  46.               begin
  47.                 diff:= H[w+K-1] -H[w]; 
  48.                 if diff<mindiff then mindiff:=diff; 
  49.                 w:=w+1;
  50.               end;  
  51.     spread := mindiff;
  52. end;
  53. begin
  54. 	readln(N, K);
  55.     for i:=0 to N-1 do read(H[i]);
  56.     readln;
  57.     ordinamento (0,N-1,H, true);
  58.     writeln(spread(N, K, H));
  59. end.
Success #stdin #stdout 0s 5304KB
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stdin
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10 3
67 90 22 79 95 89 76 21 65 99
stdout
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6
https://ideone.com/WFUxn0
language:
Pascal (fpc 3.0.4)
created:
2 days ago
visibility:
public

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