题解 | #xxx定律#

#include <stdio.h>

int main(){
    int n;
    while(scanf("%d",&n) != EOF){
        int num=0;
        while(n != 1){
            if (n%2 == 0){
                n=n/2;
                num++;
                if (n==1){
                    break;
                }
            }
            if (n%2 == 1){
                n=(3*n+1)/2;
                num++;
                if (n==1){
                    break;
                }
            }
        }
        printf("%d\n",num);
    }
    return 0;
}