1 files changed, 27 insertions, 0 deletions
diff --git a/challenge-331/deadmarshal/java/Ch2.java b/challenge-331/deadmarshal/java/Ch2.java
new file mode 100644
index 0000000000..db7b5c136b
--- /dev/null
+++ b/challenge-331/deadmarshal/java/Ch2.java
@@ -0,0 +1,27 @@
+public class Ch2 {
+  public static void main(String[] args) {
+    System.out.println(buddy_strings("fuck", "fcuk"));
+    System.out.println(buddy_strings("love", "love"));
+    System.out.println(buddy_strings("fodo", "food"));
+    System.out.println(buddy_strings("feed", "feed"));
+  }
+
+  private static boolean buddy_strings(String s1, String s2) {
+    if (s1.length() != s2.length()) return false;
+    int diff = 0;
+    int[] count1 = new int[26];
+    int[] count2 = new int[26];
+    for (int i = 0; i < s1.length(); ++i) {
+      int a = s1.charAt(i), b = s2.charAt(i);
+      ++count1[a - 'a'];
+      ++count2[b - 'a'];
+      if (a != b) ++diff;
+    }
+    boolean f = false;
+    for (int i = 0; i < 26; ++i) {
+      if (count1[i] != count2[i]) return false;
+      if (count1[i] > 1) f = true;
+    }
+    return diff == 2 || (diff == 0 && f);
+  }
+}