delete pics to save space

history_source/信息学奥赛一本通/3.4.7.2.cpp

@@ -0,0 +1,141 @@
+#include<iostream>
+#include<string>
+#include<algorithm>
+#include<stack>
+#include<cstring>
+using namespace std;
+string word[50005],str;
+int n;
+int sh[27][27];//< -1   > 1
+stack<int> stk;
+char hsh[27];
+int du[27];
+bool hs[27];
+string mp;
+bool op(string &a,string &b)
+{
+	int max_len=min(a.size(),b.size());
+	for(int i=0;i<max_len;i++)
+	{
+		if(a[i]!=b[i])
+			switch(sh[a[i]-'a'][b[i]-'a'])
+			{
+				case 1:
+					return 1;
+				case -1:
+					return 0;
+				case 0:
+					sh[a[i]-'a'][b[i]-'a']=-1;
+					sh[b[i]-'a'][a[i]-'a']=1;
+					return 0;
+			}
+	}
+	return 0;
+}
+int main()
+{
+	freopen("virus.in","r",stdin);
+	freopen("virus.out","w",stdout);
+	cin>>n;
+	for(int i=0;i<n;i++)
+	{
+		cin>>word[i];
+		for(int j=0;j<word[i].size();j++)
+			if(!hs[word[i][j]-'a'])
+			{
+				hs[word[i][j]-'a']=1;
+				mp+=word[i][j];
+			}
+	}
+	cin>>str;
+	for(int i=1;i<n;i++)
+		for(int j=0;j<i;j++)
+			if(op(word[j],word[i]))
+			{
+				cout<<0<<endl;
+//				cout<<"break in place 1!\n"<<endl;
+				return 0;
+			}
+	sort(mp.begin(),mp.end());
+	for(int i=0;i<mp.size();i++)
+		for(int j=0;j<mp.size();j++)
+			if(j!=i&&sh[mp[j]-'a'][mp[i]-'a']==-1)
+				du[mp[i]-'a']++;
+//	cout<<"du: "<<endl;
+//	for(int i=0;i<mp.size();i++)
+//		cout<<mp[i]<<" "<<du[mp[i]-'a']<<endl;
+	for(int i=0;i<mp.size();i++)
+		if(!du[mp[i]-'a'])
+			stk.push(mp[i]-'a');
+	if(stk.size()>=2)
+	{
+		cout<<0<<endl;
+//		cout<<"break in place 2!\n"<<endl;
+		return 0;
+	}
+	int now=0;
+	memset(hsh,-1,sizeof(hsh));
+//	cout<<"stack:";
+	while(stk.size())
+	{
+		hsh[stk.top()]=now++;
+		du[stk.top()]=-1;
+//		cout<<char(stk.top()+'a');
+		for(int i=0;i<mp.size();i++)
+			if(stk.top()!=mp[i]-'a'&&sh[stk.top()][mp[i]-'a']==-1)
+			{
+				sh[stk.top()][mp[i]-'a']=0;
+				du[mp[i]-'a']--;
+			}
+		stk.pop();
+		for(int i=0;i<mp.size();i++)
+			if(!du[mp[i]-'a'])
+				stk.push(mp[i]-'a');
+		if(stk.size()>=2)
+		{
+//			cout<<endl;
+//			cout<<"du: "<<endl;
+//			for(int i=0;i<mp.size();i++)
+//				 cout<<mp[i]<<" "<<du[mp[i]-'a']<<endl;
+			cout<<0<<endl;
+//			cout<<"break in place 3!\n"<<endl;
+			return 0;
+		}
+	}
+//	cout<<endl;
+	for(int i=0;i<str.size();i++)
+		if(hsh[str[i]-'a']>-1)
+			str[i]=hsh[str[i]-'a']+'a';
+		else
+		{
+			cout<<0<<endl;
+//			cout<<"break in place 4!\n"<<endl;
+			return 0;
+		}
+	cout<<str<<endl;
+	return 0;
+}
+/*
+c -> a
+e -> b
+d -> c
+a -> d
+b -> e
+
+6
+cebdbac
+cac
+ecd
+dca
+aba
+bac
+cedab
+
+
+abeceda
+ada
+bac
+cad
+ded
+eda
+*/