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//#include <stdio.h>
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//#include <stdbool.h>
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//#include <stdlib.h>
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//#include <time.h>
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//
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//// <20><>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//void printMatrix(int matrix[9][9]) {
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// for (int i = 0; i < 9; i++) {
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// if (i == 0 || i == 3 || i == 6) {
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// printf("|-----------------------|\n");
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// }
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// for (int j = 0; j < 9; j++) {
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// if (j == 0 || j == 3 || j == 6) {
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// printf("| ");
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// }
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// if (matrix[i][j] == 0) {
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// printf(". ");
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// }
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// else {
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// printf("%d ", matrix[i][j]);
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// }
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// if (j == 8) {
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// printf("|\n");
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// }
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// }
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// if (i == 8) {
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// printf("|-----------------------|\n");
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// }
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// }
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ij<EFBFBD><C4B3><EFBFBD>г<EFBFBD><D0B3><EFBFBD>
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//int isInRow(int matrix[9][9], int row, int num) {
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// for (int i = 0; i < 9; i++) {
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// if (matrix[row][i] == num) {
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// return 1;
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// }
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// }
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// return 0;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ij 3x3 <20>Ӿ<EFBFBD><D3BE><EFBFBD><EFBFBD>г<EFBFBD><D0B3><EFBFBD>
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//int isInGroup(int matrix[9][9], int startRow, int startCol, int num) {
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// for (int i = 0; i < 3; i++) {
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// for (int j = 0; j < 3; j++) {
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// if (matrix[startRow + i][startCol + j] == num) {
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// return 1;
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// }
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// }
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// }
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// return 0;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ij<EFBFBD><C4B3><EFBFBD><EFBFBD><EFBFBD>ѱ<EFBFBD>ʹ<EFBFBD><CAB9>
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//bool usedInRow(int matrix[9][9], int row, int num) {
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// for (int col = 0; col < 9; col++) {
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// if (matrix[row][col] == num) {
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// return true;
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// }
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// }
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// return false;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ij<EFBFBD><C4B3><EFBFBD><EFBFBD><EFBFBD>ѱ<EFBFBD>ʹ<EFBFBD><CAB9>
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//bool usedInCol(int matrix[9][9], int col, int num) {
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// for (int row = 0; row < 9; row++) {
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// if (matrix[row][col] == num) {
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// return true;
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// }
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// }
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// return false;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ij 3x3 <20>Ӿ<EFBFBD><D3BE><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѱ<EFBFBD>ʹ<EFBFBD><CAB9>
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//bool usedInBox(int matrix[9][9], int boxStartRow, int boxStartCol, int num) {
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// for (int row = 0; row < 3; row++) {
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// for (int col = 0; col < 3; col++) {
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// if (matrix[row + boxStartRow][col + boxStartCol] == num) {
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// return true;
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// }
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// }
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// }
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// return false;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD>ض<EFBFBD>λ<EFBFBD>÷<EFBFBD><C3B7><EFBFBD><EFBFBD>ض<EFBFBD><D8B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ȫ
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//bool isSafe(int matrix[9][9], int row, int col, int num) {
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// return!usedInRow(matrix, row, num) && !usedInCol(matrix, col, num) && !usedInBox(matrix, row - row % 3, col - col % 3, num);
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//}
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//
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//// <20><><EFBFBD>ҿ<EFBFBD>λ<EFBFBD><CEBB>
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//bool findEmptyLocation(int matrix[9][9], int* row, int* col) {
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// for (*row = 0; *row < 9; (*row)++) {
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// for (*col = 0; *col < 9; (*col)++) {
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// if (matrix[*row][*col] == 0) {
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// return true;
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// }
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// }
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// }
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// return false;
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//}
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//
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//// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//bool solveSudoku(int matrix[9][9]) {
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// int row, col;
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// if (!findEmptyLocation(matrix, &row, &col)) {
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// return true; // <20><><EFBFBD><EFBFBD><EFBFBD>ѽ<EFBFBD><D1BD><EFBFBD>
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// }
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// for (int num = 1; num <= 9; num++) {
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// if (isSafe(matrix, row, col, num)) {
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// matrix[row][col] = num;
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// if (solveSudoku(matrix)) {
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// return true;
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// }
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// matrix[row][col] = 0; // <20><><EFBFBD><EFBFBD>
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// }
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// }
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// return false;
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//}
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//
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//// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//bool checkRows(int matrix[9][9]) {
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// for (int i = 0; i < 9; i++) {
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// int count[9] = { 0 };
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// for (int j = 0; j < 9; j++) {
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// if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
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// int num = matrix[i][j] - 1;
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// if (count[num] > 0) {
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// return false;
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// }
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// count[num]++;
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// }
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// }
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// }
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// return true;
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//}
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//
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//// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//bool checkColumns(int matrix[9][9]) {
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// for (int j = 0; j < 9; j++) {
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// int count[9] = { 0 };
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// for (int i = 0; i < 9; i++) {
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// if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
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// int num = matrix[i][j] - 1;
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// if (count[num] > 0) {
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// return false;
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// }
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// count[num]++;
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// }
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// }
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// }
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// return true;
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//}
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//
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//// <20><><EFBFBD><EFBFBD> 3x3 <20>Ӿ<EFBFBD><D3BE><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//bool checkSubMatrices(int matrix[9][9]) {
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// for (int row = 0; row < 9; row += 3) {
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// for (int col = 0; col < 9; col += 3) {
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// int count[9] = { 0 };
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// for (int i = row; i < row + 3; i++) {
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// for (int j = col; j < col + 3; j++) {
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// if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
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// int num = matrix[i][j] - 1;
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// if (count[num] > 0) {
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// return false;
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// }
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// count[num]++;
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// }
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// }
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// }
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// }
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// }
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// return true;
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//}
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//
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//// <20>ж<EFBFBD><D0B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><D0A7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//bool isSudokuMatrix(int matrix[9][9]) {
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// return checkRows(matrix) && checkColumns(matrix) && checkSubMatrices(matrix);
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//}
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//
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//int main() {
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// printf("The original Sudoku matrix: \n");
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// srand(time(NULL));
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// int matrix[9][9] = { 0 };
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// int numbers[9] = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
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//
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// for (int group = 0; group < 3; group++) {
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// int usedNumbers[9] = { 0 };
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// for (int i = 0; i < 9; i++) {
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// usedNumbers[i] = numbers[i];
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// }
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//
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// for (int i = 0; i < 9; i++) {
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// int idx = rand() % (9 - i);
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// int temp = usedNumbers[idx];
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// usedNumbers[idx] = usedNumbers[8 - i];
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// usedNumbers[8 - i] = temp;
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// }
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//
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// for (int row = 0; row < 3; row++) {
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// int count = 0;
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// while (count < 3) {
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// int num;
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// do {
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// int idx = rand() % 9;
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// num = usedNumbers[idx];
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// } while (num == 0 || isInRow(matrix, group * 3 + row, num) || isInGroup(matrix, group * 3, 0, num));
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//
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// int pos;
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// do {
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// pos = rand() % 9;
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// } while (matrix[group * 3 + row][pos] != 0);
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//
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// matrix[group * 3 + row][pos] = num;
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// count++;
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// }
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// }
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// }
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//
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// for (int row = 0; row < 9; row++) {
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// int uniqueNumbers[9] = { 0 };
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// int uniqueCount = 0;
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// for (int i = 0; i < 9; i++) {
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// if (matrix[row][i] != 0 && !uniqueNumbers[matrix[row][i] - 1]) {
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// uniqueNumbers[matrix[row][i] - 1] = 1;
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// uniqueCount++;
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// }
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// }
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// if (uniqueCount > 3) {
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// while (uniqueCount > 3) {
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// int idx = rand() % 9;
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// if (matrix[row][idx] != 0 && uniqueNumbers[matrix[row][idx] - 1]) {
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// matrix[row][idx] = 0;
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// uniqueCount--;
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// }
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// }
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// }
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// else if (uniqueCount < 3) {
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// while (uniqueCount < 3) {
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// int num;
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// do {
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// num = rand() % 9 + 1;
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// } while (uniqueNumbers[num - 1]);
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// int idx;
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// do {
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// idx = rand() % 9;
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// } while (matrix[row][idx] != 0);
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// matrix[row][idx] = num;
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// uniqueNumbers[num - 1] = 1;
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// uniqueCount++;
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// }
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// }
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// }
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//
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// printMatrix(matrix);
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// bool valid = isSudokuMatrix(matrix);
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// if (valid) {
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// printf("True:Valid initial Sudoku matrix!\n");
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// if (solveSudoku(matrix)) {
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// printf("The solution of Sudoku matrix:\n");
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// printMatrix(matrix);
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// }
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// else {
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// printf("No solution!\n");
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// }
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// }
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// else {
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// printf("False:Invalid initial Sudoku matrix!\n");
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// for (int j = 0; j < 9; j++) {
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// int count[9] = { 0 };
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// for (int i = 0; i < 9; i++) {
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// if (matrix[i][j] > 0 && matrix[i][j] <= 9) {
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// int num = matrix[i][j] - 1;
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// if (count[num] > 0) {
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// printf("The number %d in the col %d has been used!\n", matrix[i][j], j);
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// break;
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// }
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// count[num]++;
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// }
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// }
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// }
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// printf("No solution!\n");
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// }
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// return 0;
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//}
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