*****************************************************TLE CODE *************************************************************
int dx[4] = {0 , -1 , 0 , 1} ; . int dy[4] = {-1 , 0 , 1 , 0} ;
``````
bool checker (vector<vector> grid , int i , int j , int n , int m )
{
if(i >= 0 && i < n && j >= 0 && j < m && ( grid[i][j] == '1'))
return true;
return false;
}
void dfs(vector<vector> &grid , int i , int j ,int r , int c) {
grid[i][j] = '0';
for(int k = 0 ; k < 4 ; k ++ )
{
int newx = i + dx[k] ;
int newy = j + dy[k] ;
if( checker(grid , newx , newy , r , c) )
{
grid[newx][newy] = '0';
dfs(grid , newx , newy , r , c);
}
}} class Solution { public: int numIslands(vector<vector>& grid) {
int r = grid.size() ;
int c = grid[0].size() ;
int cnt = 0 ;
for(int i = 0 ; i < r ; i ++ )
{
for(int j = 0 ; j < c ; j ++ )
{
if(grid[i][j] == '1')
{
cnt ++ ;
dfs(grid , i , j ,r , c);
}
}
}
return cnt ;
}};
************************************************** AC CODE *******************************************************************
int dx[4] = {0 , -1 , 0 , 1} ; int dy[4] = {-1 , 0 , 1 , 0} ;
void dfs(vector<vector> &grid , int i , int j ,int r , int c) {
grid[i][j] = '0';
for(int k = 0 ; k < 4 ; k ++ )
{
int newx = i + dx[k] ;
int newy = j + dy[k] ;
if(newx >= 0 && newx < r && newy >= 0 && newy < c && ( grid[newx][newy] == '1'))
{
grid[newx][newy] = '0';
dfs(grid , newx , newy , r , c);
}
}} class Solution { public: int numIslands(vector<vector>& grid) {
int r = grid.size() ;
int c = grid[0].size() ;
int cnt = 0 ;
for(int i = 0 ; i < r ; i ++ )
{
for(int j = 0 ; j < c ; j ++ )
{
if(grid[i][j] == '1')
{
cnt ++ ;
dfs(grid , i , j ,r , c);
}
}
}
return cnt ;
}}; ******************************************************************************************************************************
Both codes are same but there is one difference I used cheacker function that's why i am getting tle why this is happening ? please tell me anyone.
Thanks in advance !!
1) Plz, use spoiler tag or smth to more readable code in blogs.
2) Your checker function copying vector. You need to use reference to vector instead of copy;