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Cod sursa(job #196626)
Type list=array[1..1000000] of longint;
var f:text;
suma,x:list;
n,m,i,j,k,s,st,dr,mij:longint;
ok:boolean;
procedure Sort(var a:list; l, r: longint);
var
i, j, x, y: longint;
begin
i := l; j := r; x := a[(l+r) DIV 2];
repeat
while a[i] < x do i := i + 1;
while x < a[j] do j := j - 1;
if i <= j then
begin
y := a[i]; a[i] := a[j]; a[j] := y;
i := i + 1; j := j - 1;
end;
until i > j;
if l < j then Sort(a,l, j);
if i < r then Sort(a,i, r);
end;
procedure afisare(p:longint);
var i,j,k,q:longint;
Begin
for i:=1 to n do
for j:=1 to n do
for k:=1 to n do
if (x[i]+x[j]+x[k]=suma[p]) then begin
Write(f,x[i],' ',x[j],' ',x[k],' ');
exit;
end;
end;
begin
assign(f,'loto.in');reset(f);
readln(f,n,s);
for i:=1 to n do read(f,x[i]);
close(f);
m:=0;
for i:=1 to n do
for j:=1 to n do
for k:=1 to n do begin
inc(m);
suma[m]:=x[i]+x[j]+x[k];
end;
Sort(suma,1,m);
ok:=false;
st:=1;
dr:=m;
assign(f,'loto.out');rewrite(f);
while st<=dr do begin
mij:=(st+dr) div 2;
if suma[st]+suma[dr]=s then begin
ok:=true;
afisare(st);
afisare(dr);
st:=dr+1;
end
else begin
while (suma[st]+suma[dr]>s) and (dr>=1) do dec(dr);
while (suma[st]+suma[dr]<s) and (st<=m) do inc(st);
end;
end;
if not ok then write(f,-1);
close(f);
end.