Programmers_43163 : 단어 변환

Author: spring0913

week10/Programmers_43163(단어 변환).java

@@ -0,0 +1,43 @@
+class Solution {
+
+    private String[] words;
+    private boolean[] visited;
+    private String target;
+    private int answer;
+
+    public int solution(String begin, String _target, String[] _words) {
+        words = _words;
+        target = _target;
+        visited = new boolean[words.length];
+        answer = Integer.MAX_VALUE;
+        dfs(begin, 0, 0);
+        return (answer == Integer.MAX_VALUE) ? 0 : answer;
+    }
+
+    public void dfs(String now, int step, int count) {
+        if(now.equals(target)) {
+            answer = Math.min(answer, count);
+            return;
+        }
+        if(step == words.length) {
+            return;
+        }
+
+        for(int i=0; i<words.length; i++) {
+            if(!visited[i] && check(now, words[i])) {
+                visited[i] = true;
+                dfs(words[i], step+1, count+1);
+                visited[i] = false;
+            }
+        }
+    }
+
+    public boolean check(String s1, String s2) {
+        int count = 0;
+        int len = s1.length();
+        for(int i=0; i<len; i++) {
+            count += (s1.charAt(i) == s2.charAt(i)) ? 1 : 0;
+        }
+        return (count == len-1);
+    }
+}