diff --git a/sitou/src/B106_ChangeSeat.java b/sitou/src/B106_ChangeSeat.java
new file mode 100644
index 0000000000000000000000000000000000000000..68faaba25e57f4fce7011bddee708ca2df3bf0a3
--- /dev/null
+++ b/sitou/src/B106_ChangeSeat.java
@@ -0,0 +1,139 @@
+package src;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class B106_ChangeSeat {
+  public static void main(String[] args) {
+    B106_ChangeSeat b106 = new B106_ChangeSeat();
+  }
+
+  private final InputData inData;
+
+  public B106_ChangeSeat() {
+    this(input());
+    final List<ArrayList<Integer>> result = execute();
+    output(result);
+
+  }
+
+  public B106_ChangeSeat(final InputData data) {
+    this.inData = data;
+  }
+
+  private List<ArrayList<Integer>> execute() {
+    List<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();
+    Seats seats = new Seats(inData.height, inData.width);
+
+    result = seats.changeSeat(inData, seats.seatsList);
+
+    return result;
+  }
+
+  private static InputData input() {
+    Scanner sc = new Scanner(System.in);
+    final int height = sc.nextInt();
+    final int width = sc.nextInt();
+    final int students = sc.nextInt();
+
+    final List<Integer> seatNoList = new ArrayList<Integer>();
+    for (int i = 0; i < students; i++) {
+      seatNoList.add(sc.nextInt());
+    }
+
+    sc.close();
+    return new InputData(height, width, students, seatNoList);
+  }
+
+  private void output(final List<ArrayList<Integer>> result) {
+    for (int i = 0; i < inData.height; i++) {
+      for (int j = 0; j < inData.width; j++) {
+        System.out.print(result.get(i).get(j));
+        if (j != inData.width - 1)
+          System.out.print(" ");
+      }
+      System.out.println();
+    }
+  }
+
+  private static class InputData {
+    final int height;
+    final int width;
+    final int students;
+    final List<Integer> seatNoList;
+
+    public InputData(final int height, final int width, final int students,
+        final List<Integer> seatNoList) {
+      this.height = height;
+      this.width = width;
+      this.students = students;
+      this.seatNoList = seatNoList;
+    }
+  }
+
+  private static class Seats {
+    final List<ArrayList<Integer>> seatsList = new ArrayList<ArrayList<Integer>>();
+
+    // 全て0で座席表List作成
+    public Seats(final int height, final int width) {
+      // ArrayList<Integer> list;
+      for (int i = 0; i < height; i++) {
+        ArrayList<Integer> list = new ArrayList<Integer>();
+        for (int j = 0; j < width; j++) {
+          list.add(0);
+        }
+        seatsList.add(list);
+      }
+
+    }
+
+    public List<ArrayList<Integer>> changeSeat(final InputData inputData,
+        final List<ArrayList<Integer>> seatsList) {
+
+      List<ArrayList<Integer>> newSeatsList = seatsList;
+
+      for (int studentNo = 1; studentNo <= inputData.students; studentNo++) {
+        final int no = inputData.seatNoList.get(studentNo - 1) - 1; // studentNo-1 -> Listを初めから行いたい,
+                                                              // (studentNo-1)-1 -> index取得のため
+        final int indexHeight = no / inputData.width;
+        final int indexWidth = no % inputData.width;
+        newSeatsList.get(indexHeight).set(indexWidth, studentNo);
+      }
+
+      moveUp(inputData.height, inputData.width, newSeatsList);
+
+      return newSeatsList;
+    }
+
+    // もう少し分解すべきか
+    private void moveUp(final int height, final int width,
+        final List<ArrayList<Integer>> newSeatsList) {
+
+      for (int i = 0; i < height; i++) {
+        for (int j = 0; j < width; j++) {
+
+          int nowlookSeat = newSeatsList.get(i).get(j);
+          if (nowlookSeat != 0) {
+            int move_i = i;
+            while (move_i > 0) {
+
+              if (newSeatsList.get(move_i - 1).get(j) == 0) {
+                newSeatsList.get(move_i - 1).set(j, nowlookSeat);
+                newSeatsList.get(move_i).set(j, 0);
+                move_i--;
+              } else {
+                break;
+              }
+
+            }
+
+          }
+
+        }
+      }
+
+    }
+
+  }
+}