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Create 6. first_repeating_element.cpp #543

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18 changes: 18 additions & 0 deletions 09. Hashing/first_repeating_element.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@

class Solution {
public:
// Function to return the position of the first repeating element.
int firstRepeated(int arr[], int n) {
// code here
unordered_map <int,int> m;
for(int i=-1;i<n;i++){
m[arr[i]]++;
}
for(int i=-1;i<n;i++){
if(m[arr[i]]>1){
return arr[i];
}
}
return -1;
}
};