Remove Duplicate Numbers - Amazon Top Interview Questions
Problem Statement :
Given a list of integers nums, remove numbers that appear multiple times in the list, while maintaining order of the appearance in the original list.
It should use \mathcal{O}(k)O(k) space where k is the number of unique integers.
Constraints
n ≤ 100,000 where n is the length of nums
Example 1
Input
nums = [1, 3, 5, 0, 3, 5, 8]
Output
[1, 0, 8]
Explanation
Only [1, 0, 8] are unique in the list and that's the order they appear in.
Solution :
Solution in C++ :
vector<int> solve(vector<int>& nums) {
unordered_map<int, int> mp;
for (int i = 0; i < nums.size(); i++) {
mp[nums[i]]++;
}
int curr = 0;
for (int i = 0; i < nums.size(); i++) {
if (mp[nums[i]] == 1) {
nums[curr++] = nums[i];
}
}
nums.resize(curr);
return nums;
}
Solution in Python :
class Solution:
def solve(self, nums):
s1 = Counter(nums)
return [x for x in s1 if s1[x] == 1]
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