Weekly Contest 78-------->811. Subdomain Visit Count (split string with space and hash map)
A website domain like "discuss.leetcode.com" consists of various subdomains. At the top level, we have "com", at the next level, we have "leetcode.com", and at the lowest level, "discuss.leetcode.com". When we visit a domain like "discuss.leetcode.com", we will also visit the parent domains "leetcode.com" and "com" implicitly.
Now, call a "count-paired domain" to be a count (representing the number of visits this domain received), followed by a space, followed by the address. An example of a count-paired domain might be "9001 discuss.leetcode.com".
We are given a list cpdomains
of count-paired domains. We would like a list of count-paired domains, (in the same format as the input, and in any order), that explicitly counts the number of visits to each subdomain.
Example 1: Input: ["9001 discuss.leetcode.com"] Output: ["9001 discuss.leetcode.com", "9001 leetcode.com", "9001 com"] Explanation: We only have one website domain: "discuss.leetcode.com". As discussed above, the subdomain "leetcode.com" and "com" will also be visited. So they will all be visited 9001 times.
Example 2: Input: ["900 google.mail.com", "50 yahoo.com", "1 intel.mail.com", "5 wiki.org"] Output: ["901 mail.com","50 yahoo.com","900 google.mail.com","5 wiki.org","5 org","1 intel.mail.com","951 com"] Explanation: We will visit "google.mail.com" 900 times, "yahoo.com" 50 times, "intel.mail.com" once and "wiki.org" 5 times. For the subdomains, we will visit "mail.com" 900 + 1 = 901 times, "com" 900 + 50 + 1 = 951 times, and "org" 5 times.
Notes:
- The length of
cpdomains
will not exceed100
. - The length of each domain name will not exceed
100
. - Each address will have either 1 or 2 "." characters.
- The input count in any count-paired domain will not exceed
10000
. - The answer output can be returned in any order.
Approach #1: C++.
class Solution { public: vector<string> subdomainVisits(vector<string>& cpdomains) { unordered_map<string, int> mp; vector<string> ans; for (int i = 0; i < cpdomains.size(); ++i) { istringstream iss(cpdomains[i]); string s; vector<string> temp; while (getline(iss, s, ' ')) { temp.push_back(s.c_str()); } int num = stoi(temp[0]); string str = temp[1]; temp.clear(); istringstream jss(str); // get the subdomains stack<string> stk; while (getline(jss, s, '.')) { stk.push(s.c_str()); } s = stk.top(); stk.pop(); while (!stk.empty()) { mp[s] += num; s = stk.top() + '.' + s; stk.pop(); } mp[s] += num; } for (auto it = mp.begin(); it != mp.end(); ++it) { string mario = to_string(it->second) + ' ' + it->first; ans.push_back(mario); } return ans; } };
In this question I learned how to split string using istringstream and string splice. then stroe the substring with unordered_map.
相关文章
- java中string类型转换成map
- ES6(十一)Set和Map
- Google Earth Engine ——数据全解析专辑(Global Map of Oil Palm Plantations)全球油棕种植园数据集!
- customize-cra 打包时 去除 map 文件
- Java8 快速实现List转map 、分组、过滤等操作
- C#String.Split (string[], StringSplitOptions) 多参数分割得到数组
- MFC中STL容器中Vector,List,Map基本用法汇总
- java new map
- Java List/Set/Map
- List、Map、Set
- How to Iterate Over a Map in Java?(如何遍历Map)
- LeetCode 205 Isomorphic Strings(同构的字符串)(string、vector、map)(*)
- 【打表】声母和韵母的所有组合(unordered_map + vector+ string )
- java程序:set改造成map
- 【bzoj5206】[Jsoi2017]原力 根号分治+STL-map