我查看了不同的资源,但仍然对如何将json格式解析为自定义对象感到困惑
class Resident
attr_accessor :phone, :addr
def initialize(phone, addr)
@phone = phone
@addr = addr
end
end
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和JSON文件
{
"Resident": [
{
"phone": "12345",
"addr": "xxxxx"
}, {
"phone": "12345",
"addr": "xxxxx"
}, {
"phone": "12345",
"addr": "xxxxx"
}
]
}
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将json文件解析为3 Resident对象数组的正确方法是什么?
我正在尝试通过邻接列表构建图形,这意味着我需要所有节点的列表,并且在每个节点类中,我还需要一个数据结构来保存所有相邻节点.只是想知道最好的结构是什么(快速搜索目标节点类).数组是否有效?
我是ruby的新手,我正在尝试编写一个dijkstra函数,但我的哈希排序似乎根本不起作用
def distance(start_code, end_code, map)
#initialize hash for distance
#distance are initialized to -1
dist_hash=Hash.new()
start_hash=Hash.new()
parent_hash=Hash.new()
close_list=Array.new()
find=-1
map.citylist.each do |e|
dist_hash[e]=[+1.0/0.0]
end
start_hash[start_code]=0
parent_hash[start_code]=start_code
while (start_hash.empty?)==false
#sort the hash
start_hash.sort_by {|k,v| v}
puts 'value'
puts start_hash.values()
#pop the first item in the hash
h=start_hash.shift()
curr_key=h[0]
curr_val=h[1]
curr_city=map.findcity(curr_key)
close_list<<curr_city.code
#for every one in adjacent list
curr_city.get_adj_city().each do |e|
#if it in the close list then igonore
if close_list.include?(e)==false
#if it is not in the start_hash then add to start …Run Code Online (Sandbox Code Playgroud) 我试图struct some_struct在C中声明一个指针数组
我可不可以做:
some_struct* arr[10];
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代替:
some_struct** arr=(some_struct**)malloc(10*sizeof(some_struct*));
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有什么区别?