LeetCode 2295: Replace Elements in an Array Solution
Master LeetCode problem 2295 (Replace Elements in an Array), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2295. Replace Elements in an Array
Problem Explanation
Explanation
To solve this problem, we can iterate through the operations and update the elements in the nums array based on the given operations. We can use a HashMap to map the original values to their corresponding replacements. We start by populating the HashMap with the initial values from the nums array. Then, we iterate through the operations and update the values in the HashMap accordingly. Finally, we construct the resulting array based on the updated values in the HashMap.
- Time complexity: O(n + m) where n is the length of the nums array and m is the number of operations.
- Space complexity: O(n) for the HashMap to store the mappings.
Solution Code
import java.util.*;
class Solution {
public int[] replaceElements(int[] nums, int[][] operations) {
Map<Integer, Integer> map = new HashMap<>();
for (int num : nums) {
map.put(num, num);
}
for (int[] op : operations) {
map.put(op[0], op[1]);
}
int[] result = new int[nums.length];
for (int i = 0; i < nums.length; i++) {
result[i] = map.get(nums[i]);
}
return result;
}
}Try It Yourself
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