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// @Title: 连续数组 (Contiguous Array)
// @Author: 15816537946@163.com
// @Date: 2022-03-19 17:01:42
// @Runtime: 88 ms
// @Memory: 7.2 MB
func findMaxLength(nums []int) int {
    var cnt, ret int
    m := make(map[int]int)
    m[0] = -1

    for i, n := range nums {
        if n == 1 {
            cnt++
        } else {
            cnt--
        }

        if preIdx, ok := m[cnt];ok {
            ret = max(ret, i-preIdx)
        } else {
            m[cnt] = i
        }
    }
    
    return ret
}

func max(a, b int) int {
    if a > b {
        return a
    }
    return b 
}