全WA求助，下的数据过了

#include <cstdio>
#include <cmath>

char a[40005];
int main()
{
    char tem;
    int cnt = 0;
    while(scanf("%c", &tem) == 1)
    {
        if(tem != '\n')
        {
            a[++cnt] = tem; 
        }
    }
    printf("%d ", (int)sqrt(cnt));
    int cntt = 0, st = 0;
    for(int i = 1; i <= cnt + 1; i++)
    {
        if(a[i] != st + '0' || i == cnt + 1)
        {
            printf("%d ", cntt);
            st = 1 - st;
            cntt = 0;
        }
        cntt++;
    }
    return 0;
}

1.in:

11111
00100
11111
00100
11111

1.out:

5 0 5 2 1 2 5 2 1 2 5 

the code:

5 0 5 2 1 2 5 2 1 2 5 

但是全WA，求助 orz