分书问题

#include <stdio.h>

const int like[5][5] = {
    {0, 0, 1, 1, 0},
    {1, 1, 0, 0, 1},
    {0, 1, 1, 0, 1},
    {0, 0, 0, 1, 0},
    {0, 1, 0, 0, 1}
};
int take[5], book[5] = {0, 0, 0, 0, 0};

void _try(int i) {
    static int n = 0;
    int j, k;

    for (j = 0; j <= 4; j++) {
        if (like[i][j] > 0 && book[j] == 0) {
            take[i] = j;
            book[j] = 1;
            if (i == 4) {
                n++;
                printf("No.%d scheme\n", n);
                for (k = 0; k <= 4; k++)
                    printf("book %d is given to %c\n", take[k], (char)k + 'A');
                putchar('\n');
            }
            else {
                _try(i + 1);
            }
            book[j] = 0;
        }
    }
}

int main() {
    _try(0);
    return 0;
}