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Number of Distinct Island GFG #237

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Number of Distinct Island GFG #237

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37 changes: 37 additions & 0 deletions Dsa/NumberofDistinctIsland.cpp
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Original file line number Diff line number Diff line change
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// Number of Distinct Islands
// GFG
class Solution {
public:
void helper(vector<vector<int>> &grid,int i,int j,string &st){
if(i<0 || j<0 || i>=grid.size() || j>=grid[0].size() || grid[i][j]==0)return ;
grid[i][j]=0;
st=st+"d";
helper(grid,i+1,j,st);
st=st+"u";
helper(grid,i-1,j,st);
st=st+"r";
helper(grid,i,j+1,st);
st=st+"l";
helper(grid,i,j-1,st);
}
int countDistinctIslands(vector<vector<int>>& grid) {
// code here
int count=0;
int n=grid.size();
int m=grid[0].size();
unordered_map<string,int> mp;
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(grid[i][j]==1){
string st="";
helper(grid,i,j,st);
if(mp.find(st)==mp.end()){
count++;
}
mp[st]++;
}
}
}
return count;
}
};