ZeroJudge [a016: 數獨(SUDOKU)] by Go-Ice

#include <stdio.h>
#include <stdlib.h>

main(){
    int array[9][9];
    int check[10];
    int flag; /* 1 = yes */
    int indexR, indexC, index;
    int startR, startC, nine;

    while ( scanf("%d", &array[0][0]) != EOF ){
        for ( indexR=0 ; indexR<9 ; indexR++ ){
            for ( indexC=0 ; indexC<9 ; indexC++ ){
                if ( indexR==0 && indexC==0 )
                    continue;
                scanf("%d", &array[indexR][indexC]);
            }
        }

        flag = 1;

        /* check each row */
        for ( indexR=0 ; indexR<9 ; indexR++ ){
            /* reset check[index] */
            for ( index=0 ; index<10 ; index++ )
                check[index]=0;

            for ( indexC=0 ; indexC<9 ; indexC++ ){
                check[array[indexR][indexC]]++;
                if ( check[array[indexR][indexC]] > 1 ){
                    flag = 0;
                    break;
                }
            }

            if ( flag == 0 )
                break;
        } /* END row check */

        /* check each column */
        if ( flag == 1){
            for ( indexR=0 ; indexR<9 ; indexR++ ){
                /* reset check[index] */
                for ( index=0 ; index<10 ; index++ )
                    check[index]=0;

                for ( indexC=0 ; indexC<9 ; indexC++ ){
                    check[array[indexC][indexR]]++;
                    if ( check[array[indexC][indexR]] > 1 ){
                        flag = 0;
                        break;
                    }
                }

                if ( flag == 0 )
                    break;
            }
        } /* END column check */

        if ( flag == 1 ){
            startR=0, startC=0;
            for ( nine=1 ; nine<10 ; nine++ ){
                /* reset check[index] */
                for ( index=0 ; index<10 ; index++ )
                        check[index]=0;

                for ( indexR=startR ; indexR<startR+3 ; indexR++ ){
                    for ( indexC=startC ; indexC<startC+3 ; indexC++ ){
                        check[array[indexR][indexC]]++;
                        if ( check[array[indexR][indexC]] > 1 ){
                            flag = 0;
                            break;
                        }
                    }
                    if ( flag == 0 )
                        break;
                }
                if ( flag == 0 )
                    break;

                if ( startC == 6 )
                    startC = 0;
                else startC += 3;

                if ( nine%3 == 0 )
                    startR += 3;

            } /* END for nine */
        }

        if ( flag == 0 )
            printf("no\n");
        else printf("yes\n");

    } /* END big while */

    system("PAUSE");
    return 0;
}