题解 | #删除字符串中出现次数最少的字符#

import Foundation

while let line = readLine() {

    var minCount = line.count + 1

    var map = [Character:Int]()
    
    for ch in line {
        map[ch] = (map[ch] ?? 0) + 1
    }


    for ch in map.keys {
        minCount = min(minCount, map[ch]!)
    }
    
    var str = ""

    for ch in line {
        if map[ch] != minCount {
            str.append(ch)
        }
    }

   print(str)

    // let parts = line.split(separator: " ")
    // print(Int(parts[0])! + Int(parts[1])!)
}