I wrote a program in C for recycled numbers(the problem of previous
codejam contest) .it outputs a value of 96 for A=100, B=500 whereas the
correct answer is 156. Please help me where I am wrong.
#include<stdio.h>
int power(int a,int b)
{
if(b==0) return 1;
if(b==1) return a;
return a*power(a,b-1);
}
int recycled_pairs(int x,int y)
{
int n=x,d=0,z,pairs=0,nn;
while(n) {d++;n=n/10;}
n=x;
do
{
if(n%10)
{
n=(n%10)*power(10,d-1)+n/10;
}
else
{
z=0;nn=n;
while(!(nn%10)) {z++;nn=nn/10;}
nn=n; nn=nn/(power(10,z)); nn=nn%10; //nn is here last non-zero
digit
n = nn*power(10,d-1)+n/power(10,z+1);
}
if(n!=x && n>x && n<=y) pairs++;
}while(n!=x);
return pairs;
}
main()
{
int tc,i,j,A,B,n,m,cnt,nd,x,lead;
scanf("%d",&tc);
for(i=0;i<tc;i++)
{
scanf("%d %d",&A,&B);
cnt=0;nd=0;x=A;
while(x){nd++;x=x/10;}
for(j=A;j<B;j++)
{ lead=(j/power(10,nd-1));
if(lead) {
cnt=cnt+recycled_pairs(j,B);
}
}
printf("case #%d : %d\n",i+1,cnt);
}
}
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