code 3.8 Closest point calculation array struct
code 3.9 Circulation list
Merge branch 'develop' of https://github.com/gaoduntao/Algorithms_in_C into develop
code list
list basic operation
code list.c memory allocation
Merge branch 'develop' of https://github.com/gaoduntao/Algorithms_in_C into develop
list convention
add code 3.15 string
code 3.16 two-dimensional array dynamically allocated
code 3.17 char-array
code 3.18 adjacnecy matrix
code 3.19 adjacency list
code 3.20
rename 3.20.c - 3.19.c
Merge branch 'develop'