https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/

80. Remove Duplicates from Sorted Array II.Swift

func removeDuplicates(inout nums: [Int]) -> Int {
    var dict = Dictionary<Int,Int>()
    var repeatedCount = 0
    for i in 0..<nums.count {
        let curIndex = i-repeatedCount
        let v = nums[curIndex]
        if let value = dict[v] {
            dict[v] = value + 1
            if (value > 1) {
                repeatedCount += 1
                nums.removeAtIndex(curIndex)
            }
        } else {
            dict[v] = 1
        }
    }
    return nums.count
}