题解 | xxx定律

#include <stdio.h>

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