Given a matrix mat and two integers r and c, reshape mat into a matrix with r rows and c columns.

The elements of mat must be kept in the same row major order. If the reshape is not possible, return mat unchanged.

Note: Row major order means the matrix is read from left to right within each row, starting from the first row and moving to the last row.

Constraints:

• m == mat.length

• n == mat[i].length

• 1 <= m, n <= 100

• -1000 <= mat[i][j] <= 1000

• 1 <= r, c <= 300

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