public class Solution {
int[] nums;
Random rand;
public Solution(int[] nums) {
this.nums = nums;
rand = new Random();
}
public int pick(int target) {
int rst = -1;
int count = 0;
for (int i = 0; i < nums.length; i++) {
if (nums[i] == target) {
int x = rand.nextInt(++count);
if (x == 0) {
rst = i;
}
}
}
return rst;
}
}
/**
* Your Solution object will be instantiated and called as such:
* Solution obj = new Solution(nums);
* int param_1 = obj.pick(target);
*/