delete pics to save space

history_source/信息学奥赛一本通/2.4.2.cpp

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+#include<iostream>
+#include<string> 
+#include<algorithm>
+#include<cstring>
+using namespace std;
+string biao;
+short *ans;
+bool *use;
+void answer(int step)
+{
+	if(step==biao.size())
+	{
+		for(int i=0;i<biao.size();i++) cout<<biao[ans[i]];
+		cout<<'\n';
+		return; 
+	}
+	for(int i=0;i<biao.size();i++)
+	{
+		if(use[i])
+		{
+			use[i]=0;
+			ans[step]=i;
+			answer(step+1);
+			use[i]=1;
+		}
+	}
+}
+int main()
+{
+	ios::sync_with_stdio(0);
+	cin>>biao;
+	sort(biao.begin(),biao.end());
+	ans=new short[biao.size()];
+	use=new bool[biao.size()];
+	memset(use,1,biao.size());
+	answer(0);
+	cout<<flush;
+	return 0;
+}