delete pics to save space

history_source/ccf 入门篇/U4/4.3.6.cpp

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+#include<iostream>
+using namespace std;
+int main()
+{
+	int n,a;
+	while(true)
+	{
+		cin>>n;
+		a=1;
+		while(n!=1)
+		{
+			if(n%2==0) n/=2;
+			else n=3*n+1;
+			a++;
+		} 
+		cout<<a<<endl;
+	}
+}