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Given a matrix **mat** of size **R*C** with 0 and 1’s, find the largest rectangle of all 1’s in the matrix. The rectangle can be formed by swapping any pair of columns of given matrix.

**Example 1:**

**Input:**
R = 3, C = 5
mat[][] = {{0, 1, 0, 1, 0},
{0, 1, 0, 1, 1},
{1, 1, 0, 1, 0}};
**Output:** 6
**Explanation: **The largest rectangle's area
is 6. The rectangle can be formed by
swapping column 2 with 3. The matrix
after swapping will be
0 0 1 1 0
0 0 1 1 1
1 0 1 1 0

**Example 2:**

**Input:
**R = 4, C = 5
mat[][] = {{0, 1, 0, 1, 0},
{0, 1, 1, 1, 1},
{1, 1, 1, 0, 1},
{1, 1, 1, 1, 1}};
**Output:** 9

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **maxArea()** which takes the 2D array of booleans **mat,** **r **and** c**** **as parameters and returns an integer denoting the answer.

**Expected Time Complexity:** O(R*(R + C))

**Expected Auxiliary Space:** O(R*C)

**Constraints:**

1<= R,C <=10^{3}

0 <= mat[i][j] <= 1

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Largest rectangle of 1s with swapping of columns allowed

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