diff --git a/yitou/src/SlimeKing.java b/yitou/src/SlimeKing.java
new file mode 100644
index 0000000000000000000000000000000000000000..9553ed93c2e1e9d4e187808a619813bf8f9fb140
--- /dev/null
+++ b/yitou/src/SlimeKing.java
@@ -0,0 +1,55 @@
+package src;
+
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class SlimeKing {
+  public static void main(final String[] args) {
+    final Scanner scanner = new Scanner(System.in);
+
+    // スライムの数と初期の大きさを取得
+    final int totalSlimes = scanner.nextInt();
+    final int initialSize = scanner.nextInt();
+    final int[] sizes = new int[totalSlimes];
+
+    // スライムの大きさを取得
+    for (int index = 0; index < totalSlimes; index++) {
+      sizes[index] = scanner.nextInt();
+    }
+
+    final int result = becomeKing(sizes, initialSize);
+    System.out.println(result);
+  }
+
+  public static int becomeKing(final int[] sizes, final int initialSize) {
+    // スライムの大きさをソート
+    final int[] sortedSizes = Arrays.copyOf(sizes, sizes.length); // コピー作成
+    Arrays.sort(sortedSizes);
+    int count = 0;
+    int currentSize = initialSize;
+
+    final int maxSize = sortedSizes[sortedSizes.length - 1]; // 最大のスライムの大きさ
+
+    while (currentSize <= maxSize) {
+      boolean found = false;
+
+      // 自分の大きさ以下のスライムの中で最も大きいものを探す
+      for (int index = sortedSizes.length - 1; index >= 0; index--) {
+        if (sortedSizes[index] != -1 && sortedSizes[index] <= currentSize) {
+          currentSize += sortedSizes[index];
+          count++;
+          sortedSizes[index] = -1; // 取り込んだスライム無効
+          found = true;
+          break;
+        }
+      }
+
+      // 取り込めるスライムがない場合
+      if (!found) {
+        return -1;
+      }
+    }
+
+    return count;
+  }
+}
diff --git a/yitou/test/SlimeKingTest.java b/yitou/test/SlimeKingTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..0a5e8ce42132c5d0ff1a140dafc97e83966e4aaa
--- /dev/null
+++ b/yitou/test/SlimeKingTest.java
@@ -0,0 +1,32 @@
+package test;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+import src.SlimeKing;
+
+public class SlimeKingTest {
+
+  @Test
+  public void 取り込みが成功し自分が一番大きなるとき() {
+    final int[] sizes = {10, 13, 15, 40};
+    final int initialSize = 10;
+    final int expected = 3;
+    assertEquals(expected, SlimeKing.becomeKing(sizes, initialSize));
+  }
+
+  @Test
+  public void 取り込めるスライムがいないとき() {
+    final int[] sizes = {25, 30, 35};
+    final int initialSize = 20;
+    final int expected = -1;
+    assertEquals(expected, SlimeKing.becomeKing(sizes, initialSize));
+  }
+
+  @Test
+  public void 最初から一番大きいとき() {
+    final int[] sizes = {10, 20, 25};
+    final int initialSize = 30;
+    final int expected = 0;
+    assertEquals(expected, SlimeKing.becomeKing(sizes, initialSize));
+  }
+}