思路:用两个for遍历
class Solution {
public int findMaxK(int[] nums) {
int max = -1;
int temp = 0;
for (int i = 0; i < nums.length; i++) {
for (int j = 0;j!=i && j < nums.length; j++) {
if(nums[i] == -nums[j]){
String s = Integer.toString(nums[i]);
if(s.contains("-")){
temp = Integer.parseInt(s.substring(1));
if(temp>max){
max = temp;
}
}else {
temp = Integer.parseInt(s);
if(temp>max){
max = temp;
}
}
}
}
}
return max;
}
}