Please help me figure out the error in my code , its giving WA.`
#include <bits/stdc++.h>
using namespace std;
#define ed "\n"
#define int long long
#define ll long long
#define fori(i, a, b) for(int i = a; i < b; i++)
#define fora(a,n) for(int i = a; i < n; i++)
#define forn(n) for(int i = 0; i < n; i++)
#define nd cout << "\n"
#define quick \
std::ios_base::sync_with_stdio(0); \
cin.tie(0); \
cout.tie(0);
const int M = 1e9 + 7;
const int N = 1e5+5;
// -----------------------------------------------------------------------------------------------
int longestp(int i,int j,vector<string> &a,vector<vector<int>> &memoize){
if(memoize[i][j]!=-1){
return memoize[i][j];
}
int h=a.size(),w=a[0].size();
int ans=1;
for(auto x :{-1,0,1}){
for(auto y:{-1,0,1}){
if(x==0 && y==0){continue;}
if(i+x<h && i+x>=0 && j+y>=0 && j+y<w && a[i+x][j+y]-a[i][j]==1){
ans=max(ans,1+longestp(i+x,j+y,a,memoize));
}
}
}
memoize[i][j]=ans;
return ans;
}
void solve()
{
while(true){
int h,w,ans=0,ct=1;
cin>>h>>w;
if(h==0 && w==0){
break;
}
vector<string>a(h);
vector<vector<int>>memoize(51,vector<int>(51,-1));
forn(h){
cin>>a[i];
}
forn(h){
fori(j,0,w){
if(a[i][j]=='A'){
ans=max(ans,longestp(i,j,a,memoize));
}
}
}
cout<<"Case"<<" "<<ct<<":"<<" "<<ans<<ed;
}
}
// ---------------------------------------------------------------------------------------
signed main()
{
quick int t = 1;
// cin >> t;
while (t--)
{
solve();
}
}`Preformatted text`
