Contiguous Array

ID: 525; medium

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Solution 1 (Java)

class Solution {
    public int findMaxLength(int[] nums) {
        Map<Integer, Integer> map = new HashMap<>();
        map.put(0, -1);
        int maxLen = 0, sum = 0;
        for (int i = 0; i < nums.length; i++) {
            sum = sum + (nums[i] == 1 ? 1 : -1);
            if (map.containsKey(sum)) {
                maxLen = Math.max(maxLen, i - map.get(sum));
            } else {
                map.put(sum, i);
            }
        }
        return maxLen;
    }
}