public static int maxSizeAlterSlice(int[] a){
    int max_size_so_far = -1;
    int cur_max_size = -1;
    if(a.length == 1)
        return 1;
    int startInd = 0;
    int endInd = 0;
    int i=1;
    int compareInd=0;
    while(i<a.length){
        if((a[compareInd]>=0 && a[i]<=0)||(a[compareInd]<=0 && a[i]>=0)){
            compareInd=i;
            endInd++;
            i++;
        }else{
            cur_max_size = endInd-startInd+1;
            if(max_size_so_far<cur_max_size){
                max_size_so_far = cur_max_size;
            }
            startInd = i;
            compareInd=startInd;
            endInd=startInd;
            i=startInd+1;
        }
    }
    return max_size_so_far;
}