rt,帮看看

#include <cstdio>
#include <cstdlib>
int n;
char k[10001],c;
void p(int r) {
    if (r > n || k[r] == '*') {
        return;
    }
    printf("%c",k[r]);
    p(2 * r);
    p(2 * r + 1);
    return;
}
int main() {
    scanf("%d\n",&n);
    scanf("%c%c%c\n",&k[1],&k[2],&k[3]);
    for (int i = 1;i < n;i ++) {
        c = getchar();
        for (int j = 1;j <= n;j ++) {
            if (k[j] == c) {
                k[2 * j] = getchar();
                k[2 * j + 1] = getchar();
            }
        }
        getchar();
    }
    p(1);
    printf("j");
	return 0;
}