S N IU

S N IUCc s nguyn dng: 3748, 58, 859, 32435465768 c gi l cc s n iu do nu quan st cc ch s ca cc s ny, ta thy chng lun phin tng gim hoc gim tng. Chng hn:

3 < 7 > 4 < 8 v 3 > 2 < 4 > 3 < 5 > 4 < 6 > 5 < 7 > 6 < 8

S ch c mt ch s l s n iu chiu di 1.

Nhim v:

Vit chng trnh xc nh s ch s u tin ln nht to thnh s n iu ca mt s cho trc.

Tn tp tin chng trnh:

WIGGLE.PAS

D liu:

Cho trong tp tin vn bn WIGGLE.IN, gm mt dng duy nht cha mt s nguyn dng duy nht c khng qu 75 ch s.

Kt qu:

Cho trong tp tin vn bn WIGGLE.OUT, cha mt s nguyn duy nht ch s ch s u tin ln nht to thnh s n iu ca s tng ng trong tp tin d liu.

V d:

WIGGLE.INWIGGLE.OUT

37484

program sdd;

uses crt;

var f1,f2:text;

n,i:longint;

x:string;

ok:boolean;

begin

clrscr;

assign(f1,'qqq.inp');

reset(f1);

assign(f2,'www.out');

rewrite(f2);

readln(f1,n);

str(n,x);

for i:=1 to length(x)-2 do

if (ord(x[i])-ord(x[i+1]))*(ord(x[i+2])-ord(x[i+1]))