Q32 Contiguous Array - LeetCode

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Thu Jan 26 2023 21:22:29 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public int findMaxLength(int[] nums) {
//treat 0's as -1 and 1 as 1 and keep finding PSA if PSA repeats anywhere then subarray between them will also be 0 compare that length and update answers
//use HM<Psa,Index> to store psa and their index

        int psa=0  , max = 0 ; //psa = prefix sum array
        HashMap<Integer,Integer> map = new HashMap<>();
        map.put(0,-1);

        for(int i = 0 ;i < nums.length ; i++){
            int val = nums[i] == 0 ?-1 : 1 ;
            
            psa += val;

            if(map.containsKey(psa)){
                int len = i - map.get(psa);
                max = Math.max(max , len);
            }
            else
            map.put(psa,i);

        }
        return max;
    }
}

https://leetcode.com/problems/contiguous-array/

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