struct TS {

        int index;

        char name[];

    };

    struct TS b[] = {{,"s5"},{,"s2"},{,"s3"},{,"s1"},{,"s8"}};

    struct TS a[];

    int i;

    int length = sizeof(a) / sizeof (struct TS);

    for(i=;i<length;i++){

        struct TS tmp = {,""};

        a[i] = tmp;

    }

    for (i=; i<; i++) {

        int num = b[i].index;

        if(a[num].index >= ){

            a[num] = b[i];

        }else{

            struct TS tmp = {,""};

            a[num] = tmp;

        }

    }

    for (i=; i<; i++) {

        if(a[i].index)

            printf("%s\n",a[i].name);

    }