Q38 Rabbits in Forest - LeetCode

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Fri Jan 27 2023 14:59:04 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public int numRabbits(int[] answers) {
        //make a HM to store <answers of rabits , actual rabits>
        HashMap<Integer,Integer> map = new HashMap<>();
        int ans = 0;
        for(int val : answers){
            
//if that answer already exists, might mean that rabbit belongs to same colour
            if(map.containsKey(val)){

//if already that color of rabbits is 0 and still the answer is same means there might be same no. of rabits of different color , so we remove the old color store the answer and add the new color group 
                if(map.get(val) == 0){
                    ans += val+1;
                    map.put(val , val);
                }

//if answer already exists and there is frequency left,means that rabbit also belong to that same colour and he will take one spot and decrement frequency
                else{
                    map.put(val , map.get(val)-1);
                }
            }
//if answer doesn't already exists means its a new color of rabit
            else{
                map.put(val , val);
            }
        }

//now add all (keys + 1) values in the answer as while mapping the colour to frequency we already take into account the spot of the rabbit which is giving the answer 
        for(int val : map.keySet())
        ans += val+1;

        return ans;
    }
}

https://leetcode.com/problems/rabbits-in-forest/

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