YangTsePrograme.c

@@ -0,0 +1,146 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <time.h>
+
+bool isValid(int grid[9][9], int r, int c, int num);
+
+void generateIncompleteGrid(int grid[9][9]) {
+    srand(time(NULL));
+    int i, j, block; 
+    for (i = 0; i < 9; i++) {
+        for (j = 0; j < 9; j++) {
+            grid[i][j] = 0;
+        }
+    }
+    for (block = 0; block < 3; block++) {
+        int used[10] = {0}; 
+        for (i = 0; i < 3; i++) {
+            int r = block * 3 + i;
+            int placedNum = 0;
+            while (placedNum < 3) {
+                int num = (rand() % 9) + 1; 
+                int c = rand() % 9;
+                if (grid[r][c] == 0 && isValid(grid, r, c, num) && used[num] == 0) {
+                    grid[r][c] = num;
+                    used[num] = 1; 
+                    placedNum++;
+                }
+            }
+        }
+    }
+}
+
+void print(int grid[9][9]) {
+    int i, j;
+    for (i = 0; i < 9; i++) {
+        for (j = 0; j < 9; j++) {
+            printf("%2d ", grid[i][j]);
+            if ((j + 1) % 3 == 0 && j < 8) {
+                printf("| ");
+            }
+        }
+        printf("\n");
+        if ((i + 1) % 3 == 0 && i < 8) {
+            printf("-----------------------\n");
+        }
+    }
+}
+
+bool isValid(int grid[9][9], int r, int c, int num) {
+    int x, i, j;
+    for (x = 0; x < 9; x++) {
+        if (grid[r][x] == num || grid[x][c] == num) {
+            return false;
+        }
+    }
+
+    int startR = r - r % 3, startC = c - c % 3;
+    for (i = 0; i < 3; i++) {
+        for (j = 0; j < 3; j++) {
+            if (grid[i + startR][j + startC] == num) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+bool solve(int grid[9][9]) {
+    int r, c;
+    bool empty = false;
+    
+    for (r = 0; r < 9; r++) {
+        for (c = 0; c < 9; c++) {
+            if (grid[r][c] == 0) {
+                empty = true;
+                break;
+            }
+        }
+        if (empty) break;
+    }
+
+    if (!empty) return true;
+
+    int num;
+    for (num = 1; num <= 9; num++) {
+        if (isValid(grid, r, c, num)) {
+            grid[r][c] = num;
+
+            if (solve(grid)) {
+                return true;
+            }
+            
+            grid[r][c] = 0;
+        }
+    }
+    return false;
+}
+
+bool validate(int grid[9][9]) {
+    int r, c;
+    for (r = 0; r < 9; r++) {
+        for (c = 0; c < 9; c++) {
+            if (grid[r][c] != 0) {
+                int num = grid[r][c];
+                grid[r][c] = 0; 
+                if (!isValid(grid, r, c, num)) {
+                    return false;
+                }
+                grid[r][c] = num; 
+            }
+        }
+    }
+    return true;
+}
+
+int main() {
+    int grid[9][9];
+    int board0[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}};
+    
+    generateIncompleteGrid(grid);
+    printf("The original Sudoku matrix:\n");
+    print(board0);
+    
+    if (validate(board0)) {
+        printf("True:Valid initial Sudoku matrix!\n");
+        if (solve(board0)) {
+            printf("Completed Sudoku Grid:\n");
+            print(board0);
+        } else {
+            printf("No solution exists for this Sudoku.\n");
+        }
+    } else {
+        printf("False:Invalid initial Sudoku matrix!\n");
+    }
+    return 0;
+}
+