/**
 * @param {number[][]} matrix
 * @return {boolean}
 */
var isToeplitzMatrix = function(matrix) {
  let n = matrix.length;
  let m = matrix[0].length;
  for (let i = 0; i < n - 1; i++) {
    for (let j = 0; j < m - 1; j++) {
      if (matrix[i][j] != matrix[i + 1][j + 1]) {
        return false;
      }
    }
  }
  return true;
};
 

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