LeetCode 2022: Convert 1D Array Into 2D Array Solution
Master LeetCode problem 2022 (Convert 1D Array Into 2D Array), a easy 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.
2022. Convert 1D Array Into 2D Array
Problem Explanation
Explanation
To solve this problem, we need to iterate through the original array and construct a 2D array with m rows and n columns. We can achieve this by checking if the total number of elements in the original array matches the number of elements required for the 2D array. If it does, we can iterate through the original array and populate the 2D array row by row. If not, we return an empty 2D array.
- Time complexity: O(m*n)
- Space complexity: O(m*n)
Solution Code
class Solution {
public int[][] construct2DArray(int[] original, int m, int n) {
if (original.length != m * n) {
return new int[0][0];
}
int[][] result = new int[m][n];
int index = 0;
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
result[i][j] = original[index++];
}
}
return result;
}
}Try It Yourself
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