delete pics to save space

history_source/信息学奥赛一本通/3.2.3.cpp

@@ -0,0 +1,44 @@
+#include<iostream>
+#include<string>
+#include<cstring>
+using namespace std;
+int main()
+{
+	int can[10]={1,1,1,1,1,1,1,1,1,1},a,b;
+	bool change[10][10]={0},use[10]={0};
+	int queue[15];
+	int head=0,tail=0;
+	string num;
+	cin>>num;
+	int k;
+	cin>>k;
+	for(int i=0;i<k;i++)
+	{
+		cin>>a>>b;
+		change[a][b]=1;
+	}
+	for(int i=0;i<10;i++)
+	{
+		tail=head=0;
+		queue[tail++]=i;
+		memset(use,0,sizeof(use));
+		use[i]=1;
+		while(tail-head>0)
+		{
+			for(int j=0;j<10;j++)
+			{
+				if(change[queue[head]][j]&&!use[j])
+				{
+					queue[tail++]=j;
+					use[j]=1;
+				}
+			}
+			head++;
+		}
+		can[i]=tail;
+	}
+	int ans=1;
+	for(int i=0;i<num.size();i++) ans*=can[num[i]-'0'];
+	cout<<ans<<endl;
+	return 0;
+}