# If the line begin with '#', then this line will be ignored.
# There should not be empty line.
# The first line must be 'n =' and followed by a number for dimension n.
# 以'#'開頭的行將被忽略掉, 是注釋行. 不要有空行.
# 第一個有用行必須以'n ='開頭, 接著是系數(shù)矩陣的維數(shù).
n = 3
# Then input the augmented matrix(that is coefficient matrix A and b.
# A should be on left side, while b should be on right side).
# There should be n+1 numbers in a line(n numbers of A and one of b).
# 接著輸入增廣矩陣（也就是系數(shù)矩陣A和b. A在左邊, b在右邊）.
# 每一行應該有 n+1 個數(shù), n 個是矩陣A的, 一個b的.
#         A                     b
  1     0.5     0.5             1
0.5       1     0.5            -2
0.5     0.5       1             3
# The line exceed n will also be ignored .
# 按維數(shù)輸完A和b后, 接下來的所有行都會被忽略.