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func search(nums []int, target int) int {
    s, e := 0, len(nums)
    for s < e {
        m := (s + e) / 2
        if nums[m] == target {
            return m
        } else if nums[m] < target {
            s = m + 1
        } else {
            e = m
        }
    }
    return -1
}