matrix/checkMatrix.c

#include "myMatrix.h"

int checkMatrix(int matrixArr[9][9], int isPrintInfo){
  int rowCnt[9][10]={0};
  int colCnt[9][10]={0};
  int bloCnt[9][10]={0};
  for(int i=0;i<9;i++){
    for(int j=0;j<9;j++){
      if(matrixArr[i][j]!=0){
        rowCnt[i][matrixArr[i][j]]++;
        if(rowCnt[i][matrixArr[i][j]]>1){
          if(isPrintInfo){
            printf("\nFalse:Invalid initial Sudoku matrix!\n");
            printf("\nThe number %d in the row %d has been used!\n",matrixArr[i][j],i+1);
          }
          return 0;
        }
        colCnt[j][matrixArr[i][j]]++;
        if(colCnt[j][matrixArr[i][j]]>1){
          if(isPrintInfo){
            printf("\nFalse:Invalid initial Sudoku matrix!\n");
            printf("\nThe number %d in the col %d has been used!\n",matrixArr[i][j],j+1);
          }
          return 0;
        }
        bloCnt[i/3*3+j/3][matrixArr[i][j]]++;
        if(bloCnt[i/3*3+j/3][matrixArr[i][j]]>1){
          if(isPrintInfo){
            printf("\nFalse:Invalid initial Sudoku matrix!\n");
            printf("\nThe number %d in the block %d has been used!\n",matrixArr[i][j],i/3*3+j/3+1);
          }
          return 0;
        }
      }
    }
  }
  if(isPrintInfo){
    printf("\nTrue:Valid initial Sudoku matrix!\n");
  }
  return 1;
}

// int main(){
//   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}};
//   int board1[9][9] = {{8, 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}};
// 
//   printf("The original Sudoku matrix: \n");
//   matrixOutput(board1);
//   checkMatrix(board1,1);
//   return 0;
// }