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  1. const INP = 'input.txt';
  2. var
  3.         f : text;
  4.         n, i, j, a, b, sum : integer;
  5.         len, s, p : array[1..1000] of integer;
  6.         G : array[1..100,1..100] of integer;
  7. BEGIN
  8.  
  9.         {doc du lieu tu tep}
  10.         assign(f, INP);
  11.         reset(f);
  12.  
  13.         readln(f, n, a, b);
  14.         writeln(n, ' ', a, ' ', b);
  15.         sum :=0;
  16.         for i:=1 to n do
  17.         begin
  18.                 for j:=1 to n do
  19.                 begin
  20.                         read(f, G[i, j]);
  21.                         sum := sum + G[i, j];
  22.                 end;
  23.                 readln(f);
  24.         end;
  25.  
  26.         {dat vo cung cho tat ca cap dinh khong co duong di}
  27.         for i:=1 to n do
  28.                 for j:=1 to n do
  29.                         if (i <> j) and (G[i, j] = 0) then
  30.                                 G[i, j] := sum;
  31.  
  32.         for i:=1 to n do
  33.         begin
  34.                 len[i] := sum; {khoi tao do dai tu a toi moi dinh la vo cung}
  35.                 s[i] := 0;     {danh sach cac diem da xet}
  36.                 p[i] := a;     {diem bat dau cua moi dinh la a}
  37.         end;                   {do dai tu a den a la 0}
  38.         len[a] := 0;
  39.  
  40.         while (s[b] = 0) do     {trong khi dinh b chua duoc duyet}
  41.         begin
  42.                 for i:=1 to n do    {tim 1 dinh chua xet ma co the di tu a den no}
  43.                 begin
  44.                         if (s[i]=0) and (len[i] < sum) then
  45.                         begin
  46.                                 break;
  47.                         end;
  48.                 end;
  49.                 if i>n then      {khong tim thay dinh nao, dung lai}
  50.                 begin
  51.                         break;
  52.                 end;
  53.  
  54.                 for j:=1 to n do     {tim dinh ma duong di tu a den no la nho nhat}
  55.                         if (s[j] = 0) and (len[i] > len[j]) then i := j;
  56.  
  57.                 s[i] := 1;            {danh dau da duyet}
  58.  
  59.                 for j:=0 to n do      {tinh lai duong di den cac dinh chua xet}
  60.                         if (s[j] = 0) and (len[i] + G[i, j] < len[j]) then
  61.                         begin
  62.                                 len[j] := len[i] + G[i, j];
  63.                                 p[j] := i;
  64.                         end;
  65.         end;
  66.  
  67.         i := b;
  68.         while(i <>a) do
  69.         begin
  70.                 write(i, ' <-- ');
  71.                 i := p[i];
  72.         end;
  73.         writeln(a);
  74. END.
Runtime error #stdin #stdout 0s 300KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Runtime error 2 at $080480CF
  $080480CF
  $08063C73
https://ideone.com/c7J0dq
dijkstra pascal
language:
Pascal (fpc 3.0.4)
created:
9 years ago
visibility:
public

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