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  1. {$M 4000000000}
  2. const maxn = 2000;
  3.       maxm = 5000;
  4.       fi = '';
  5.       fo = '';
  6. var m,n,t:word;
  7.     a: array[1..maxn,0..maxm] of word;
  8.     visit: array[1..maxn] of boolean;
  9. procedure enter;
  10. var i,j,u,v:word;
  11. begin
  12.   assign(input,fi);
  13.   reset(input);
  14.   readln(n,m);
  15.   for i:=1 to n do
  16.   begin
  17.     a[i,0]:=0;
  18.     visit[i]:=false;
  19.   end;
  20.   for i:=1 to m do
  21.   begin
  22.     readln(u,v);
  23.     inc(a[u,0]);
  24.     a[u,a[u,0]]:=v;
  25.     inc(a[v,0]);
  26.     a[v,a[v,0]]:=u;
  27.   end;
  28. end;
  29. procedure dfs(i:word);
  30. var j:word;
  31. begin
  32.   visit[i]:=true;
  33.   for j:=1 to a[i,0] do
  34.   if not visit[a[i,j]] then dfs(a[i,j]);
  35. end;
  36. procedure solve;
  37. var i:word;
  38. begin
  39.   assign(output,fo);
  40.   rewrite(output);
  41.   t:=0;
  42.   for i:=1 to n do
  43.   if not visit[i] then
  44.   begin
  45.     inc(t);
  46.     dfs(i);
  47.   end;
  48.   writeln(m-n+t);
  49.   close(output);
  50. end;
  51. begin
  52.   enter;
  53.   solve;
  54. end.
Success #stdin #stdout 0s 19816KB
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https://ideone.com/K9pu6K
language:
Pascal (fpc 3.0.4)
created:
8 years ago
visibility:
secret

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