sda pb 2 past exam 1

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#define N 10

inline int toInt(char ch) {
    return ch - 'a';
}


int fr[3] = { 3, 4, 3 };
char s[N];
int cnt = 0;
void bktr(int k) {
    if (k == N) {
        for (int i = 0; i < N; i++) {
            printf("%c", s[i]);
        }
        puts("");
        cnt++;
        if (cnt == 5) {
            exit(EXIT_SUCCESS);
        }
        return;
    }

    for (char ch = 'a'; ch <= 'c'; ch++) {
        if (fr[toInt(ch)] != 0) {
            fr[toInt(ch)]--;
            s[k] = ch;
            bktr(k + 1);
            fr[toInt(ch)]++;
        }
    }
}

int main(void) {
    bktr(0);
    return 0;
}