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#include<bits/stdc++.h>
using namespace std;
int visited[NMAX][NMAX];
int cx[]={0,0,-1,1};
int cy[]={1,-1,0,0};
int outside(int i,int j,int n,int m)
{
    if(i>=0&&j>=0&&i<n&&j<n)
        return 1;
    else return 0;
}
 
int dfs(char cake[NMAX][NMAX],int i,int j,int n)
{    
    if(visited[i][j]==1)
        return 0;
//    cout<<"i : "<<i<<" "<<"j : "<<j<<endl;
    visited[i][j]=1;
    int count=1;
    for(int k=0;k<4;k++)
    {
        int x=i+cx[k];
        int y=i+cy[k];
        if(outside(x,y,n,n) && cake[x][y]=='1')
        {
            count+=dfs(cake,x,y,n);
        }
    }
    return count;
}
int solve(int n,char cake[NMAX][NMAX])
{
	memset(visited,0,sizeof(visited));
    int maximise=0;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
            if(cake[i][j]=='1' && visited[i][j]==0)
            {
                maximise=max(maximise,dfs(cake,i,j,n));
            }
        }
    }
    return maximise;
}
 

prog.cpp:3:13: error: ‘NMAX’ was not declared in this scope
 int visited[NMAX][NMAX];
             ^~~~
prog.cpp:3:13: note: suggested alternative: ‘NAN’
 int visited[NMAX][NMAX];
             ^~~~
             NAN
prog.cpp:3:19: error: ‘NMAX’ was not declared in this scope
 int visited[NMAX][NMAX];
                   ^~~~
prog.cpp:3:19: note: suggested alternative: ‘NAN’
 int visited[NMAX][NMAX];
                   ^~~~
                   NAN
prog.cpp:13:19: error: ‘NMAX’ was not declared in this scope
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
                   ^~~~
prog.cpp:13:19: note: suggested alternative: ‘NAN’
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
                   ^~~~
                   NAN
prog.cpp:13:25: error: ‘NMAX’ was not declared in this scope
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
                         ^~~~
prog.cpp:13:25: note: suggested alternative: ‘NAN’
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
                         ^~~~
                         NAN
prog.cpp:13:30: error: expected ‘)’ before ‘,’ token
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
        ~                     ^
                              )
prog.cpp:13:31: error: expected unqualified-id before ‘int’
 int dfs(char cake[NMAX][NMAX],int i,int j,int n)
                               ^~~
prog.cpp:31:27: error: ‘NMAX’ was not declared in this scope
 int solve(int n,char cake[NMAX][NMAX])
                           ^~~~
prog.cpp:31:27: note: suggested alternative: ‘NAN’
 int solve(int n,char cake[NMAX][NMAX])
                           ^~~~
                           NAN
prog.cpp:31:33: error: ‘NMAX’ was not declared in this scope
 int solve(int n,char cake[NMAX][NMAX])
                                 ^~~~
prog.cpp:31:33: note: suggested alternative: ‘NAN’
 int solve(int n,char cake[NMAX][NMAX])
                                 ^~~~
                                 NAN
prog.cpp: In function ‘int solve(...)’:
prog.cpp:33:9: error: ‘visited’ was not declared in this scope
  memset(visited,0,sizeof(visited));
         ^~~~~~~
prog.cpp:33:9: note: suggested alternative: ‘finitel’
  memset(visited,0,sizeof(visited));
         ^~~~~~~
         finitel
prog.cpp:35:19: error: ‘n’ was not declared in this scope
     for(int i=0;i<n;i++)
                   ^
prog.cpp:39:16: error: ‘cake’ was not declared in this scope
             if(cake[i][j]=='1' && visited[i][j]==0)
                ^~~~

Standard output is empty