一个基于 unordered_map 的实际问题——给定一串单词,找出单个单词的频率。 Input:str="geeks for geeks geeks quiz practice qa for"; Output:Frequenciesofindividual words are (practice,1) (for,2) (qa,1) (quiz,1) (geeks,3) 下面是使用 unor
{"GeeksForGeeks",4.789}, {"GFG",5.998} };cout<<"sizeof map = "<< ra.size() <<endl;return0; } 输出: Initialsizeof map = 0sizeof map = 4
umap.insert(make_pair(3,"GeeksforGeeks"));// Try inserting element with// duplicate keysumap.insert(make_pair(3,"CS Portal"));// Print thecountof values with key 3// to check if duplicate values are stored// or notcout<<"Count of elements in map, mapped with key 3:"<<umap.count...
//演示unordered_map size()方法的C++程序#include<iostream>#include<string>#include<unordered_map>usingnamespacestd;intmain(){unordered_map<string,double>ra;cout<<"map的初始大小= "<<ra.size()<<endl;ra={{"Geeks",1.556},{"For",2.567},{"Geeks",3.345},{"GeeksForGeeks",4.789},{"GFG",5.9...
// unordered_multimap::emplace#include<iostream>#include<string>#include<unordered_map>usingnamespacestd;intmain(){//声明unordered_multimap<string,string>sample;//插入“键”和“元素”sample.emplace("gopal","dave");sample.emplace("gopal","dave");sample.emplace("Geeks","C++");sample.emplace("...
I submitted this solution using map which took 61ms to pass:70273184. Today, I thought of submitting the same solution using unordered map, which I later found out doesn't have a hash function for pairs, so I copied the hash function fromGeeksForGeeksand then submitted the solution which ...
#include<unordered_map> usingnamespacestd; intmain() { // declaration unordered_multimap<string,string>sample; // inserts key and elements sample.emplace("gopal","dave"); sample.emplace("gopal","dave"); sample.emplace("Geeks","C++"); ...
invite_code=3ez16n7773c48 参考: https://www.geeksforgeeks.org/set-vs-unordered_set-c-stl/ https://stackoverflow.com/a/52203931/6329006 https://stackoverflow.com/a/29855973/6329006 STL map, hash_map , unordered_map区别、对比
I submitted this solution using map which took 61ms to pass:70273184. Today, just out of curiosity, I thought of submitting the same solution using unordered map, which I later found out doesn't have a hash function for pairs, so I copied the hash function fromGeeksForGeeksand then submit...
geeksforgeeks users geeks for 示例2: // C++ program to illustrate// the unordered_set.reserve()#include<iostream>#include<string>#include<unordered_set>usingnamespacestd;intmain(){// Declaration of unordered_setunordered_set<string> us; ...