diff --git a/shudo4.c b/shudo4.c
new file mode 100644
index 0000000..3df8def
--- /dev/null
+++ b/shudo4.c
@@ -0,0 +1,237 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <time.h>
+
+
+void boradprint(int** board) {
+    printf("|-----------------------|\n");
+    for (int row = 0; row < 9; row++) {
+        if (row == 3 || row == 6) {
+            printf("|-----------------------|\n");
+        }
+        printf("| ");
+        for (int col = 0; col < 9; col++) {
+            if (board[row][col] == 0) {
+                printf(". ");
+            }
+            else {
+                printf("%d ", board[row][col]);
+            }
+            if (col == 2 || col == 5) {
+                printf("| ");
+            }
+        }
+        printf("|\n");
+    }
+    printf("|-----------------------|\n");
+}
+
+void freeBoard(int** board, int rows) {
+    for (int i = 0; i < rows; i++) {
+        free(board[i]);  // 释放每一行的内存
+    }
+    free(board);  // 释放指向行的指针数组的内存
+}
+
+bool isVaild(int** borad)
+{
+    printf("The original Sudoku matrix: \n");
+    boradprint(borad);
+    int row_count = 0;
+    int col_count = 0;
+    int col_true[10] = { 0 };
+    int row_true[10] = { 0 };
+    while (row_count != 9)
+    {
+        for (int i = 0; i < 9; i++)//every raw
+        {
+            if (borad[row_count][i] > 0) //if it has define
+            {
+                if (!col_true[borad[row_count][i]])//check
+                {
+                    col_true[borad[row_count][i]] = 1;
+                }
+                else
+                {
+                    printf("False:Invalid initial Sudoku matrix!\n");
+                    printf("The number %d in the col %d has been used!\n", borad[row_count][i], row_count + 1);
+                    return false;
+                }
+            }
+        }
+        row_count++;
+        for (int i = 0; i <= 9; i++)col_true[i] = 0;
+    }
+    while (col_count != 9)
+    {
+        for (int i = 0; i < 9; i++)//every col
+        {
+            if (borad[i][col_count]) //if it has define
+            {
+                if (!row_true[borad[i][col_count]])//check
+                {
+                    row_true[borad[i][col_count]] = 1;
+                }
+                else
+                {
+                    printf("False:Invalid initial Sudoku matrix!\n");
+                    printf("The number %d in the col %d has been used!\n", borad[i][col_count], col_count + 1);
+                    return false;
+                }
+            }
+        }
+        col_count++;
+        for (int i = 0; i < 10; i++)row_true[i] = 0;
+    }
+    row_count = col_count = 0;
+    int block_count = 1;
+    int block_group[10] = { 0 };
+    int block_row = (row_count / 3) * 3;
+    int block_col = (col_count / 3) * 3;
+    while (block_count != 9)
+    {
+        for (int i = block_row; i < block_row + 3; i++)
+            for (int j = block_col; j < block_col + 3; j++)
+                if (borad[i][j])
+                    if (!block_group[borad[i][j]])block_group[borad[i][j]] = 1;
+                    else
+                    {
+                        printf("False:Invalid initial Sudoku matrix!\n");
+                        printf("The number %d in the block %d has been used!\n", borad[i][j], block_count);
+                        return false;
+                    }
+        block_count++;
+        for (int i = 0; i < 10; i++)
+        {
+            block_group[i] = 0;
+        }
+        switch (block_count)
+        {
+        case 2:block_row = 0; block_col = 3; break;
+        case 3:block_row = 0; block_col = 6; break;
+        case 4:block_row = 3; block_col = 0; break;
+        case 5:block_row = 3; block_col = 3; break;
+        case 6:block_row = 3; block_col = 6; break;
+        case 7:block_row = 6; block_col = 0; break;
+        case 8:block_row = 6; block_col = 3; break;
+        case 9:block_row = 6; block_col = 6; break;
+        default:return false;
+        }
+    }
+    printf("True:Valid initial Sudoku matrix!\n");
+    return true;
+}
+
+int** boradgenerate() {
+    int count_col = 0;
+    int count_row = 0;
+    int col[3] = { 0 };
+    int num_true[9] = { 0 };
+    int col_true[9] = { 0 };
+    int** borad;
+    borad = (int**)malloc(9 * sizeof(int*));
+    for (int i = 0; i < 9; i++)
+        borad[i] = (int*)malloc(9 * sizeof(int));
+    for (int i = 0; i < 9; i++)
+        for (int j = 0; j < 9; j++)
+            borad[i][j] = 0;
+    for (count_row = 0; count_row <= 8; count_row++) {
+        if (count_row % 3 == 0)
+            for (int i = 0; i < 9; i++)
+                num_true[i] = 0;
+        while (count_col != 3)
+        {
+            int num = rand() % 9;
+            if (!col_true[num]) {
+                col[count_col++] = num;
+                col_true[num] = 1;
+            }
+        }
+        count_col = 0;
+        for (int i = 0; i < 9; i++)
+            col_true[i] = 0;
+        while (count_col != 3)
+        {
+            int num = rand() % 9;
+            if (!num_true[num]) {
+                borad[count_row][col[count_col++]] = num + 1;
+                num_true[num] = 1;
+            }
+        }
+        count_col = 0;
+    }
+    return borad;
+}
+
+int** change(int board[][9]) {
+    int** doublePointer = (int**)malloc(9 * sizeof(int*));
+    for (int i = 0; i < 9; i++) {
+        doublePointer[i] = (int*)malloc(9 * sizeof(int));
+        for (int j = 0; j < 9; j++) {
+            doublePointer[i][j] = board[i][j];
+        }
+    }
+    return doublePointer;
+}
+
+bool solveborad(int** borad)
+{
+    printf("The original Sudoku matrix: \n");
+    isVaild(borad);
+    int** temp_borad = borad;
+    for (int i = 0; i < 9; i++)
+    {
+        for (int j = 0; j < 9; j++)
+        {
+            if (!borad[i][j]) {
+                int temp = borad[i][j];
+                for (int k = 1; k < 10; k++)
+                {
+                    temp_borad[i][j] = k;
+                    if (isVaild(temp_borad))
+                    {
+                        borad[i][j] = k;
+                        if (solveborad(borad))
+                        {
+                            printf("True:Valid initial Sudoku matrix!\n");
+                            boradprint(borad);
+                            return true;
+                        }
+                        else
+                        {
+                            borad[i][j] = temp;
+                        }
+                    }
+                    else
+                    {
+                        temp_borad[i][j] = temp;
+                    }
+                }
+                printf("No solution");
+                return false;
+            }
+        }
+
+    }
+
+    return true;
+    printf("True:Valid initial Sudoku matrix!");
+}
+
+int main() {
+    srand(time(NULL));
+    int board1[9][9] = { {5, 3, 0, 0, 7, 0, 0, 0, 0},
+{6, 0, 0, 1, 9, 5, 0, 0, 0},
+{0, 9, 8, 0, 0, 0, 0, 6, 0},
+{8, 0, 0, 0, 6, 0, 0, 0, 3},
+{4, 0, 0, 8, 0, 3, 0, 0, 1},
+{7, 0, 0, 0, 2, 0, 0, 0, 6},
+{0, 6, 0, 0, 0, 0, 2, 8, 0},
+{0, 0, 0, 4, 1, 9, 0, 0, 5},
+{0, 0, 0, 0, 8, 0, 0, 7, 9} };
+
+    int** board2 = change(board1);
+    solveborad(board2);
+    return 0;
+}