CodeForces 501B - Misha and Changing Handles

有N个改名的动作，输出改完名的最终结果。

 

拿map做映射

 

 1 #include <iostream>
 2 #include <map>
 3 #include <string>
 4 using namespace std;
 5 map<string,string> mp;
 6 map<string,int> vis;
 7 int n;
 8 string s1,s2;
 9 int main()
10 {
11     cin>>n;
12     map<string,string>::iterator it;
13     for(int i=1;i<=n;i++)
14     {
15         cin>>s1>>s2;
16         if(!vis[s1]&&!vis[s2])
17         {
18             vis[s1]=1; vis[s2]=1; mp[s1]=s2;
19         }
20         else if(vis[s1]&&!vis[s2])
21         {
22             vis[s2]=1;
23             for(it=mp.begin();it!=mp.end();it++) 
24             {
25                 if(it->second==s1) 
26                 {
27                     it->second=s2; break;
28                 }
29             }
30         }
31     }
32     cout<<mp.size()<<endl;
33     for(it=mp.begin();it!=mp.end();it++)
34     {
35         cout<<it->first<<" "<<it->second<<endl;
36     }
37 }

 

转载于:https://www.cnblogs.com/nicetomeetu/p/5678145.html