csp 201803-1 jump jump

// Score 100 
#include <the iostream>
 the using  namespace STD;
 int main () {
     int A; // a first number of separate treatment 
    CIN >> A;
     int SUM; // all scores and 
    IF (A == . 1 ) = SUM . 1 ;
     IF (a == 2 ) SUM = 2 ;
     IF (a == 0 ) SUM = 0 ;
     int i = SUM; // case where the recording step, the following set values of i is to be noted 
    the while (SUM! = 0 ) {// zero, then the first step, the ends
         int K; 
        CIN>>k;
        if(k==0) break;//game over 
        if(k==1) {i=0;sum+=1;}//不是中心点，加1    
        if(k==2){
            if(i>=2) {i+=2;sum+=i;}//是中心点且连跳，加上一次加二 
            else {i=2;sum+=2;} //中心点但不连跳，仅加二 
        }
    }
    cout<<sum<<endl;
    return 0;    
}