delete pics to save space

history_source/信息学奥赛一本通/3.4.5.4.cpp

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+#include<iostream>
+#include<string>
+#include<map>
+#define maxn 50000
+using namespace std;
+map<string,int> s_i;
+map<int,string> i_s;
+int fa[maxn+1],n,id=1,a,b;
+string str,faname;
+char mode;
+int findf(int aa)
+{
+	while(fa[aa]!=aa) aa=fa[aa];
+	return aa;
+}
+int main()
+{
+	freopen("gen.in","r",stdin);
+	freopen("gen.out","w",stdout);
+	for(int i=1;i<=maxn;i++) fa[i]=i;
+	while(mode!='$')
+	{
+		mode=getchar();
+		switch(mode)
+		{
+			case '#':
+				cin>>str;
+				if(s_i[str]==0)
+				{
+					a=id;
+					s_i[str]=id;
+					i_s[id++]=str;
+				}
+				else a=s_i[str];
+				break;
+			case '+':
+				cin>>str;
+				if(s_i[str]==0)
+				{
+					b=id;
+					s_i[str]=id;
+					i_s[id++]=str;
+					fa[b]=a;
+				}
+				else fa[s_i[str]]=a;
+				break;
+			case '?':
+				cin>>str;
+				cout<<str<<" "<<i_s[findf(s_i[str])]<<endl;
+				break;
+		}
+		getchar();
+	}
+	return 0;
+}