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Cod sursa(job #760129)
Program farfurii;
var n,k,nr,aux,m:int64;
a:array [1..100001] of longint;
b1:array [1..1 shl 17] of char;
i:longint;
fi,fo:text;
begin
assign(fi,'farfurii.in');
assign(fo,'farfurii.out');
settextbuf(fo,b1);
reset(fi); rewrite(fo); readln(fi,n,nr);
aux:=1; i:=1;
while aux<nr do begin inc(i); aux:=i*(i-1) div 2; end;
dec(i); aux:=n-i; k:=nr-i*(i-1) div 2;
for i:=1 to aux do a[i]:=i; m:=n;
for i:=aux+1 to n do begin a[i]:=m; dec(m); end;
for i:=n downto n-k+1 do begin m:=a[i]; a[i]:=a[aux]; a[aux]:=m; end;
for i:=1 to n do write(fo,a[i],' ');
close(fo);
end.