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  1. program C;
  2. const MAXN =100000;
  3. type elenco= array[1..MAXN] of Int64;
  4. var N, i, h:Longint;
  5.     diffcoord, uguali:elenco;
  6.     coordinate : array[1..MAXN, 1..2] of Int64;
  7.     squares :Int64;
  8.  
  9. Procedure scambia (var a,b: Int64);
  10. var x:Int64;
  11. begin
  12.    x:=a;
  13.    a:=b;
  14.    b:=x;
  15. end;  
  16. Procedure ordinamento (estremoi,estremos: Int64; var v : elenco; ordinato:boolean);
  17. var inf, sup, medio:Int64;
  18.     pivot :Int64;
  19. begin
  20.     inf:=estremoi;
  21.     sup:=estremos;
  22.     medio:= (estremoi+estremos) div 2;
  23.     pivot:=v[medio];
  24.     repeat
  25.       if (ordinato) then
  26.          begin
  27.             while (v[inf]<pivot) do  inf:=inf+1;
  28.             while (v[sup]>pivot) do  sup:=sup-1;
  29.          end;
  30.       if inf<=sup then
  31.        begin
  32.          scambia(v[inf],v[sup]);
  33.          inf:=inf+1;
  34.          sup:=sup-1;
  35.        end;
  36.     until inf>sup;
  37.     if (estremoi<sup) then ordinamento(estremoi,sup,v,ordinato);
  38.     if (inf<estremos) then ordinamento(inf,estremos,v,ordinato);
  39. end;
  40.  
  41. begin
  42.     read(N);
  43. 	for i:=1 to N do
  44. 	              begin
  45. 	               readln (coordinate[i][1], coordinate[i][2]);
  46. 	               diffcoord[i]:=coordinate[i][1] - coordinate[i][2];
  47. 	               uguali[i]:=1;
  48. 	              end; 
  49. 	ordinamento (1,N,diffcoord, true);
  50. 	squares:=0; h:=1; i:=1; 
  51. 	while i<N do
  52. 	         begin
  53. 	          if diffcoord[i]=diffcoord[i+1] then begin uguali[h]:=uguali[h]+1; i:=i+1; end
  54. 	                                         else begin i:=i+1; h:=h+1; end;
  55. 	         end; 
  56. 	for i:=1 to h do
  57. 	           squares:=squares+(uguali[i]*(uguali[i]-1) div 2);
  58.   writeln(squares);
  59. end.
  60.  
  61.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/p17CXi
language:
Pascal (fpc 3.0.4)
created:
15 days ago
visibility:
public

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