涨姿势stl map['a']['a']=b;

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#include "iostream"#include "stdlib.h"#include <map>using namespace std;int main(){//     map<pair<char, char>, char>mp;//     mp[{'a','a'}]='a;//     cout<<mp[{'a','a'}];//     mp[make_pair('a','a')]='a';//    cout<<mp[make_pair('a','a')];    map<char, map<char, char> > mp;    mp['a']['a']='a';    cout<<mp['a']['a'];      return 0;   }


#include "iostream"#include "stdlib.h"#include <map>using namespace std;char deal(char a,char b){     map<char, map<char, char> > mp;     mp['a']['a']='a';     return mp[a][b];     }int main(){//     map<pair<char, char>, char>mp;//////     mp[{'a','a'}]='b';//     cout<<mp[{'a','a'}];//     mp[make_pair('a','a')]='a';//    cout<<mp[make_pair('a','a')];    cout<<deal('a','a');      return 0;   }


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