diff --git a/src/JavaDoubao/XtoY.java b/src/JavaDoubao/XtoY.java
new file mode 100644
index 0000000..63490db
--- /dev/null
+++ b/src/JavaDoubao/XtoY.java
@@ -0,0 +1,43 @@
+package JavaDoubao;
+import java.util.ArrayList;
+
+public class XtoY {
+
+
+    public static class Main {
+        public static int solution(int xPosition, int yPosition) {
+            // Please write your code here
+            int diff = Math.abs(yPosition -xPosition);
+            int gone = 1;
+            ArrayList<Integer> steps = new ArrayList<>();
+            steps.add(1);
+            int lastStep = 1;
+
+            while (gone < diff/2) {
+                lastStep += 1;
+                gone += lastStep;
+                steps.add(lastStep);
+            }
+
+            if (gone*2 == diff){
+
+            }
+
+
+
+            for (Integer steps2 : steps) {
+                System.out.printf("%d,",steps2);
+            }
+            System.out.println("Result");
+
+            return steps.size();
+        }
+
+        public static void main(String[] args) {
+            // You can add more test cases here
+//            System.out.println(solution(12, 6));
+            System.out.println(solution(34, 45));
+            System.out.println(solution(50, 30));
+        }
+    }
+}
diff --git a/src/Main.kt b/src/Main.kt
index 61c027a..f4099cf 100644
--- a/src/Main.kt
+++ b/src/Main.kt
@@ -1,4 +1,4 @@
 fun main() {
-    val t = Test977()
+    val t = Test12()
     t.test()
 }
\ No newline at end of file
diff --git a/src/Test12.kt b/src/Test12.kt
new file mode 100644
index 0000000..963841d
--- /dev/null
+++ b/src/Test12.kt
@@ -0,0 +1,49 @@
+class Test12 {
+    class Solution {
+        val table = mapOf(
+            Pair(1000,"M"),
+            Pair(900,"CM"),
+            Pair(500,"D"),
+            Pair(400,"CD"),
+            Pair(100,"C"),
+            Pair(90,"XC"),
+            Pair(50,"L"),
+            Pair(40,"XL"),
+            Pair(10,"X"),
+            Pair(9,"IX"),
+            Pair(5,"V"),
+            Pair(4,"IV"),
+            Pair(1,"I")
+        )
+        val bases = arrayOf(1000,100,10,1)
+        fun intToRoman(num: Int): String {
+            var num = num
+            val result = StringBuilder()
+            bases.forEach { base ->
+                var b = num / base
+                if (b != 0) {
+                    if (table.containsKey(b * base)) {
+                        result.append(table[b * base])
+                    } else {
+                        if (b > 5) {
+                            result.append(table[5 * base])
+                            b -= 5
+                        }
+                        for (i in 0..<b) {
+                            result.append(table[base])
+                        }
+                    }
+                    num -= num / base * base
+                }
+            }
+            return result.toString()
+        }
+    }
+
+    fun test(){
+        println(Solution().intToRoman(3749))
+        println(Solution().intToRoman(58))
+        println(Solution().intToRoman(1994))
+
+    }
+}
\ No newline at end of file
diff --git a/src/Test202.kt b/src/Test202.kt
new file mode 100644
index 0000000..502a03c
--- /dev/null
+++ b/src/Test202.kt
@@ -0,0 +1,30 @@
+class Test202 {
+    class Solution {
+        fun isHappy(n: Int): Boolean {
+            var cur = n
+            val appeared = mutableListOf(n)
+            while (cur != 1){
+                print("$cur->")
+                var newNum = 0
+
+                while (cur!= 0) {
+                    val lastDigit = cur % 10
+                    newNum += lastDigit * lastDigit
+                    cur /= 10
+                }
+
+                cur = newNum
+                if (newNum in appeared){
+                    return false
+                }else{
+                    appeared.add(newNum)
+                }
+            }
+            return true
+        }
+    }
+
+    fun test(){
+        println(Solution().isHappy(2))
+    }
+}
\ No newline at end of file