OJ Board

Can anybody help me why I am getting "no" ?

@begin_of_source_code
#include<stdio.h>

unsigned long z,n,t, stack[40000][2], len[26];
long x, y, i, j, k, r, c;
char w[5000][5000], ch;

void search()
{

for( i=0; i<r; i++ )
for( j=0; j<c; j++ )
if( w [j]!='0' )
{
len[w [j]-97]++;
ch= w [j];

x ...