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단어 변환.swift
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단어 변환.swift
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//
// 단어 변환.swift
// Programmers1
//
// Created by hwangJi on 2023/03/29.
//
import Foundation
var minChangeCnt = 0
func solution(_ begin:String, _ target:String, _ words:[String]) -> Int {
if !words.contains(target) { return 0 }
var visited = Array(repeating: false, count: words.count)
dfs(words, begin, target, 0, &visited)
return minChangeCnt
}
func isChangableWord(_ word1: String, _ word2: String) -> Bool {
let word1 = Array(word1)
let word2 = Array(word2)
var diff = 0
for i in 0..<word1.count {
if word1[i] != word2[i] {
diff += 1
}
}
return diff == 1 ? true : false
}
func dfs(_ words: [String], _ word: String, _ target: String, _ depth: Int, _ visited: inout [Bool]) {
if word == target {
minChangeCnt = minChangeCnt == 0 ? depth : min(depth, minChangeCnt)
return
}
for (idx, i) in words.enumerated() {
if visited[idx] == false && isChangableWord(word, i) {
visited[idx] = true
dfs(words, i, target, depth + 1, &visited)
visited[idx] = false
}
}
}