"""ifnotmatrixornotmatrix[0]:return[] res = [] isRe =1defaddLine(row, col, isRe): line = []whilerow <len(matrix)andcol >=0: line.append(matrix[row][col]) row +=1col -=1l =len(res)ifisRe: res[l:l] = line[::-1]else: res[l:l] = lineforiinrange(len(matrix[0])...