2-猴子吃桃问题

int main() {
    int cnt = 9;// 递推的次数
    int x2 = 1;
    int x1 = 0;
    while (cnt > 0) {
        x1 = (x2 + 1) * 2;
        x2 = x1;
        cnt--;
    }
    printf("the number of peach in the first day is : %d\n", x1);
    return 0;
}