C++ set less<int> greater<int>用法示例

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2022-10-16


less<int> :按set中的key递增

#include <iostream>
#include<map>
using namespace std;
map<int,int,less<int>>mp;
int main()
{
int i;
mp[2]=22;
mp[1]=11;
mp[3]=33;

cout<<"各元素值"<<endl;
auto it1=mp.begin();
while(it1!=mp.end())
{
cout<<it1->first<<' '<<it1->second<<endl;
it1++;
}
cout<<endl;

return 0;
}

C++ set less<int> greater<int>用法示例_c++

 

greater<int> :按set中的key递减

#include <iostream>
#include<map>
using namespace std;
map<int,int,greater<int>>mp;
int main()
{
int i;
mp[2]=22;
mp[1]=11;
mp[3]=33;

cout<<"各元素值"<<endl;
auto it1=mp.begin();
while(it1!=mp.end())
{
cout<<it1->first<<' '<<it1->second<<endl;
it1++;
}
cout<<endl;

return 0;
}

C++ set less<int> greater<int>用法示例_开发语言_02

 

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