diff --git "a/\354\235\264\354\247\200\354\210\230/SWEA/D2/1961. \354\210\253\354\236\220 \353\260\260\354\227\264 \355\232\214\354\240\204" "b/\354\235\264\354\247\200\354\210\230/SWEA/D2/1961. \354\210\253\354\236\220 \353\260\260\354\227\264 \355\232\214\354\240\204"
new file mode 100644
index 00000000..a0a60a24
--- /dev/null
+++ "b/\354\235\264\354\247\200\354\210\230/SWEA/D2/1961. \354\210\253\354\236\220 \353\260\260\354\227\264 \355\232\214\354\240\204"	
@@ -0,0 +1,32 @@
+import java.util.Scanner;
+
+class Solution
+{
+	public static void main(String args[]) throws Exception
+	{
+		Scanner sc = new Scanner(System.in);
+		int T = sc.nextInt();
+		
+		for(int test_case = 1; test_case <= T; test_case++)
+		{
+            int N = sc.nextInt();
+            int[][] arr = new int[N][N];
+            char[][] result90 = new char[N][N];
+            char[][] result180 = new char[N][N];
+            char[][] result270 = new char[N][N];
+            for(int i = 0; i < N; i++) {
+                for(int j = 0; j < N; j++) {
+                	arr[i][j] = sc.nextInt();
+                    result90[j][N - i - 1] = (char)(arr[i][j] + '0');
+                    result180[N - i - 1][N - j - 1] = (char)(arr[i][j] + '0');
+                    result270[N - j - 1][i] = (char)(arr[i][j] + '0');
+                }
+            }
+            
+            System.out.println("#" + test_case);
+            for(int i = 0; i < N; i++) {
+                System.out.println(String.valueOf(result90[i]) + " " + String.valueOf(result180[i]) + " " + String.valueOf(result270[i]));
+            }
+		}
+	}
+}
diff --git "a/\354\235\264\354\247\200\354\210\230/SWEA/D2/1974. \354\212\244\353\217\204\354\277\240 \352\262\200\354\246\235" "b/\354\235\264\354\247\200\354\210\230/SWEA/D2/1974. \354\212\244\353\217\204\354\277\240 \352\262\200\354\246\235"
new file mode 100644
index 00000000..ab76cd79
--- /dev/null
+++ "b/\354\235\264\354\247\200\354\210\230/SWEA/D2/1974. \354\212\244\353\217\204\354\277\240 \352\262\200\354\246\235"	
@@ -0,0 +1,56 @@
+import java.util.Scanner;
+ 
+class Solution {
+    public static void main(String args[]) throws Exception {
+        Scanner sc = new Scanner(System.in);
+        int T = sc.nextInt();
+ 
+        for(int test_case = 1; test_case <= T; test_case++) {            
+            int[][] arr = new int[9][9];
+            for(int i = 0; i < 9; i++) {
+                for(int j = 0; j < 9; j++) {
+                    arr[i][j] = sc.nextInt();
+                }
+            }
+             
+            int rowIdx = 0;
+            int colIdx = 0;
+            boolean flag = false;
+            for(int i = 0; i < 9; i++){
+                int[] row = new int[9];
+                int[] col = new int[9];
+                int[] box = new int[9];
+                 
+                for(int j = 0; j < 9; j++) {
+                    if(row[arr[i][j] - 1] != 0 || col[arr[j][i] - 1] != 0 || box[arr[rowIdx][colIdx] - 1] != 0) {
+                        flag = true;
+                        break;
+                    }
+                     
+                    row[arr[i][j] - 1]++;
+                    col[arr[j][i] - 1]++;
+                    box[arr[rowIdx][colIdx] - 1]++;
+                    if((j + 1) % 3 == 0) {
+                        colIdx -= 2;
+                        rowIdx++;
+                    }
+                    else
+                        colIdx++;
+                }
+                if(flag) {
+                    System.out.println("#" + test_case + " " + 0);
+                    break;
+                }
+                if((i + 1) % 3 == 0) {
+                    rowIdx -= 9;
+                    colIdx += 3;
+                }
+            }
+             
+            if(!flag)
+                System.out.println("#" + test_case + " " + 1);
+        }
+         
+        sc.close();
+    }
+}