hi friends i m trying to solve this problem
http://acm.uva.es/p/v111/11151.html but getting wrong answer..
my algorithm is ....i m trying to enumarate all the n*(n+1)/2 substrings of
string ,where n is string length...
and checking for palindrom ..
suppose i have input ADAM .....then all possible substrings will be
ADAM
ADA
DAM
AD
DA
AM
A
D
A
M
now ADA is lagest palindrome ....
but i don't know why i m getting WA... or plz tell me wheather my algorithm
is right or wrong
here is my code .plz check it ..
#include<stdio.h>
#include<string.h>
int chkpalin(char* a,int k,int n)
{
int w;
for(w=k;w<=n;w++)
if(a[w]!=a[n+k-w])
return(0);
return(1);
}
main()
{
char str[1010],c;
int i,j,k,n,w,v;
scanf("%d",&k);
getchar();
for(v=0;v<k;v++)
{
w=0;
gets(str);
n=strlen(str);
for(i=n-1;i>=0;i--)
{
for(j=0;j+i<n;j++)//enumarate all the n*(n+1)/2 substrings
chk wheather a[j] to a[i+j] is palindrome or not
{
w=chkpalin(str,j,i+j);
/*for(int x=j;x<=i+j;x++)
printf("%c",str[x]);
printf("\n");*/
if(w==1)
break;
}
if(w==1)
break;
}
printf("%d\n",i+1);
/*for(int x=j;x<=i+j;x++)
printf("%c",str[x]);
printf("\n");*/
}
}
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