diff --git a/2.cpp b/2.cpp
new file mode 100644
index 0000000..7f2384c
--- /dev/null
+++ b/2.cpp
@@ -0,0 +1,54 @@
+#include <iostream>
+#include <stdlib.h>
+#include <time.h>
+int main()
+{
+	int board[9][9] = {0};
+	srand(time(NULL));
+	void generate(int board[9][9]);
+	void format(int board[9][9]);
+	generate(board);
+	format(board);
+}
+void random(int arr[9]) {
+	for (int i = 0; i < 9; i++) {
+		arr[i] = rand() % 9 + 1;
+	Re:
+		for (int j = 0; j < i; j++) {
+			while (arr[i] == arr[j]) { 
+				arr[i] = rand() % 9 + 1;
+				goto Re;
+			}
+		}
+	}
+}
+void format(int board[9][9]) { 
+	for (int i = 0; i < 9; i++) {
+		for (int j = 0; j < 9; j++) {
+			printf("%d ", board[i][j]);
+			if ((j + 1) % 3 == 0 && j != 8) {
+				printf("| ");
+			}
+		}
+		if ((i + 1) % 3 == 0 && i != 8) {
+			printf("\n---------------------\n");
+		}
+		else { printf("\n"); }
+	}
+}
+void generate(int board[9][9]) {
+	int rowplace[9] = { 0 }, rownum[9] = { 0 };
+	for (int h = 0; h < 9; h += 3) { 
+		random(rownum);
+		for (int i = h, k = -1; i < h + 3; i++) {
+			random(rowplace);
+			for (int j = 0; j < 9; j++) {
+				if (rowplace[j] < 4) {
+					k++;
+					board[i][j] = rownum[k];
+				}
+				else board[i][j] = 0;
+			}
+		}
+	}
+}
\ No newline at end of file