CF 586A 找1的个数和101的个数

Sample test(s)

input

5
0 1 0 1 1

output

4

input

7
1 0 1 0 0 1 0

output

4

input

1
0

output

0

 # include <iostream>
 # include <cstdio>
 # include <cstring>
 # include <algorithm>
 # include <string>
 # include <cmath>
 # include <queue>
 # define LL long long
 using namespace std ;

 int a[] ;

 int main()
 {
     int n;
     while(scanf("%d",&n) != EOF)
     {
        int i ;
        int sum =  ;
        int x ;
        for (i =  ; i < n  ; i++)
        {
            scanf("%d" , &x) ;
            if (x == )
              sum++ ;
            a[i] = x ;
        }
        for (i =  ; i < n  ; i++)
        {
            if (a[i] == )
              continue ;
            if (a[i] ==  && a[i+] ==  && a[i+] ==)
              sum++ ;
        }
        printf("%d\n" , sum) ;

     }
     return ;
 }