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题目：

题解：

func findMaxLength(nums []int) (maxLength int) {mp := map[int]int{0: -1}counter := 0for i, num := range nums {if num == 1 {counter++} else {counter--}if prevIndex, has := mp[counter]; has {maxLength = max(maxLength, i-prevIndex)} else {mp[counter] = i}}return
}func max(a, b int) int {if a > b {return a}return b
}