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FindDuplicateNumber.java
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51 lines (37 loc) · 1006 Bytes
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package com.vinay.practice.lc;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
// https://leetcode.com/problems/find-the-duplicate-number/description/
public class FindDuplicateNumber {
public static void main(String[] args) {
// TODO Auto-generated method stub
int[] nums = {3,1,3,4,2};
//int[] nums = {1,1};
System.out.println("Duplicate number is : " + findMissingNumbers(nums));
}
public static int findMissingNumbers(int[] nums) {
int i=0;
List<Integer> missingNumber = new ArrayList<Integer>();
// sort
while(i < nums.length) {
// if the number is not at it's correct place, swap
if(nums[i] != i+1) {
int correct = nums[i] - 1;
if(nums[i] != nums[correct]) {
swap(nums, i, correct);
} else {
return nums[i];
}
} else {
i++;
}
}
return -1;
}
public static void swap(int[] nums, int i, int correct) {
int temp = nums[correct];
nums[correct] = nums[i];
nums[i] = temp;
}
}