Transpose of a Matrix - Amazon Top Interview Questions
Problem Statement :
Given an integer square (n by n) matrix, return its transpose. A transpose of a matrix switches the row and column indices. That is, for every r and c, matrix[r][c] = matrix[c][r].
Constraints
n ≤ 100
Example 1
Input
matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
Output
[
[1, 4, 7],
[2, 5, 8],
[3, 6, 9]
]
Solution :
Solution in C++ :
vector<vector<int>> solve(vector<vector<int>>& nums) {
vector<vector<int>> v(nums.size(), vector<int>(nums.size()));
for (int i = 0; i < nums.size(); i++) {
for (int j = 0; j < nums.size(); j++) {
v[i][j] = nums[j][i];
}
}
return v;
}
Solution in Java :
import java.util.*;
class Solution {
public int[][] solve(int[][] matrix) {
if (matrix.length == 0)
return new int[0][0];
int length = matrix[0].length;
for (int i = 0; i < length; i++) {
for (int j = i + 1; j < length; j++) {
int temp = matrix[i][j];
matrix[i][j] = matrix[j][i];
matrix[j][i] = temp;
}
}
return matrix;
}
}
Solution in Python :
class Solution:
def solve(self, matrix):
for row in range(len(matrix)):
for col in range(len(matrix[0])):
if row < col:
matrix[row][col], matrix[col][row] = matrix[col][row], matrix[row][col]
return matrix
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