1 #include<cstdio> 2 #include<cstdlib> 3 #include<cmath> 4 #include<cstring> 5 #include<iostream> 6 #include<vector> 7 #include<map> 8 #include<set> 9 #include<stack> 10 #include<string> 11 #include<algorithm> 12 #define maxn +50 13 #define inf 0x7fffffff 14 #define xiao 1e-9 15 using namespace std; 16 map <string,int> ma; 17 int main() 18 { 19 ma["pear"]; 20 ma["apple"]=1; 21 ma["banana"]=2; 22 ma["lemon"]=3; 23 cout<<ma.size()<<endl; 24 cout<<ma["apple"]<<endl; 25 if(ma.count("pear")) cout<<"pear"<<endl; 26 else cout<<"no pear"<<endl; 27 cout<<ma.lower_bound("cow")->first<<endl; 28 cout<<ma.lower_bound("cow")->second<<endl; 29 cout<<ma.begin()->first<<endl; 30 cout<<ma.end()->second<<endl;//这个函数似乎并没有什么卵用 31 return 0; 32 }