在 C++ STL 中設定 lower_bound() 函式
C++ STL 中的 Set lower_bound() 函式返回指向容器中某個元素的迭代器,該元素與引數中的 k 等價。如果 k 不存在於 set 容器中,則該函式返回指向緊接在 k 之後的元素的迭代器。
演算法
Begin Initialize an empty set container s. Initializing a set container as inetrator. Insert some elements in s set container. Call function to find the lower bound value of a given key, which is passed to iter set container. Print the lower bound value of the given key. End.
示例程式碼
#include<iostream>
#include <bits/stdc++.h>
using namespace std;
int main()
{
set<int> s; //Declaring an empty set container
set<int>::iterator iter; //Declaring a set container as iterator which will point to the lower bound value
s.insert(7); //inserting elements in the set container s
s.insert(6);
s.insert(1);
s.insert(4);
s.insert(2);
s.insert(9);
s.insert(10);
iter = s.lower_bound(4); //passing a key by parameter to find its lower bound
cout <<"The lower bound of 4 is: "<< *iter << " "<<endl; //printing the lowerbound value
iter = s.lower_bound(5);
cout <<"The lower bound of 5 is: " <<*iter << " "<<endl;
iter = s.lower_bound(30);
cout <<"The lower bound of 30 is: " <<*iter << " "<<endl;
return 0;
}輸出
The lower bound of 4 is: 4 The lower bound of 5 is: 6 The lower bound of 30 is: 7
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