c++中stl 哈希函数_C ++ STL中的set :: size()函数
c++中stl 哈希函数
C ++ STL set :: size()函数 (C++ STL set::size() function)
set::size() function is a predefined function, it is used to get the size of a set, it returns the total number of elements of the set container.
set :: size()函数是预定义的函数,用于获取集合的大小,它返回集合容器中元素的总数。
Prototype:
原型:
set<T> st; //declaration
set<T>::iterator it; //iterator declaration
int sz=st.size();
Parameter: Nothing to pass
参数:无通过
Return type: Integer
返回类型:整数
Usage: The function returns size of the set
用法:该函数返回集合的大小
Example:
例:
For a set of integer,
set<int> st;
set<int>::iterator it;
st.insert(4);
st.insert(5);
set content:
4
5
int sz=st.size(); //sz=size of set that is 2
Print sz; //prints 2
Header file to be included:
包含的头文件:
#include <iostream>
#include <set>
OR
#include <bits/stdc++.h>
C++ implementation:
C ++实现:
#include <bits/stdc++.h>
using namespace std;
void printSet(set<int> st){
set<int>:: iterator it;
cout<<"Set contents are:\n";
for(it=st.begin();it!=st.end();it++)
cout<<*it<<" ";
cout<<endl;
}
int main(){
cout<<"Example of size function\n";
set<int> st;
set<int>:: iterator it;
cout<<"inserting 4\n";
st.insert(4);
cout<<"inserting 6\n";
st.insert(6);
cout<<"inserting 10\n";
st.insert(10);
printSet(st); //printing current set
//finding set sizeof
cout<<"current set size is: "<<st.size();
return 0;
}
Output
输出量
Example of size function
inserting 4
inserting 6
inserting 10
Set contents are:
4 6 10
current set size is: 3
翻译自: https://www.includehelp.com/stl/set-size-function-in-cpp-stl.aspx
c++中stl 哈希函数
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