CCF CSP 201803-1 跳一跳

 1 #include <iostream>
 2 #include <algorithm>
 3 using namespace std;
 4 int x,flag,sum,t;
 5 int main()
 6 {
 7     flag=0,t=1,sum=0;
 8     while(cin>>x&&x){
 9         if(x==1){
10             t=1;
11             sum+=t;
12         }else if(x==2){
13             if(t==1){
14                 t=2;
15             }else{
16                 t+=2;
17             }
18             sum+=t;
19         }
20     }
21     cout<<sum<<endl;
22     return 0;
23 }