一个有序数组，比如1 1 2 3 4 5 6 ，要拿到前五个不重复的长度
思路
代码实现
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public static int [] get(int [] res){
if (res.length < 1){
return res;
}
int i = 0, r = i+1;
while (r < res.length){
if (res[i]==res[r]){
r++;
continue;
}
i++;
res[i]=res[r];
r++;
}
int[] ints = Arrays.copyOf(res, i + 1);
return ints;
}
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