shusu1669 『入门』（递归专题）m位数问题

1669_nweishu/Readme.md

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+# 	1669	<09><><EFBFBD><EFBFBD><EFBFBD>š<EFBFBD><C5A1><EFBFBD><EFBFBD>ݹ<EFBFBD>ר<EFBFBD>⣩mλ<6D><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+
+[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>]  
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>n<EFBFBD><EFBFBD>m<EFBFBD><EFBFBD>1 <= n <= 8<><38>1 <= m <= 5<><35><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA>ѡ<EFBFBD>ִ<EFBFBD>1,2,<2C><>,n<><6E>ȡ<EFBFBD><C8A1>m<EFBFBD><6D><EFBFBD><EFBFBD><EFBFBD>֣<EFBFBD><D6A3><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>mλ<6D><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͳ<EFBFBD><CDB3><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>mλ<6D><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ж<EFBFBD><D0B6>ٸ<EFBFBD><D9B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>   
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>n=3,m=2ʱ<32><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>11 12 13 21 22 23 31 32 33<33><33><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD>11 13 23 31<33><31>һ<EFBFBD><D2BB><EFBFBD><EFBFBD>4<EFBFBD><34><EFBFBD><EFBFBD>  
+
+[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ]  
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>n m<><6D><EFBFBD><EFBFBD>1 <= n <= 8<><38>1 <= m <= 5 <20><><EFBFBD><EFBFBD>  
+
+[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ]  
+<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>У<EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>  <20><>
+
+[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>]  
+3 2  
+
+[<5B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>]  
+4  

1669_nweishu/doc/Readme.md

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+# 

1669_nweishu/main.cpp

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+#include <iostream>
+#include <cmath>
+using namespace std;
+int shu,chang,flag=0,ans=0;
+bool pan(int n){
+    if(n<2){
+        return 0;
+    }
+    if(n==2){
+        return 1;
+    }
+    int len=sqrt(n);
+    for(int i=2;i<=len;i++){
+        if(n%i==0){
+            return 0;
+        }
+    }
+    return 1;
+}
+
+void dg(int now){
+    if(now==chang+1){
+        if(pan(flag)==1){
+            ans++;
+        }
+    }else{
+        for(int i=1;i<=shu;i++){
+            flag*=10;
+            flag+=i;
+            dg(now+1);
+            flag/=10;
+        }
+    }
+}
+
+int main()
+{
+    cin>>shu>>chang;
+    dg(1);
+    cout<<ans;
+}

1669_nweishu/test/in.txt

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+8 4

1669_nweishu/test/in2.txt

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+8 5

1669_nweishu/test/in3.txt

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+8 1

1669_nweishu/test/out.txt

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+## z:\Chao\src\1669_nweishu\test\in.txt 
+2020/04/30 <20><><EFBFBD><EFBFBD> 18:38:22.64 
+464
+-----------------------------------------------
+Process exited after 150 ms with return value 0
+
+## z:\Chao\src\1669_nweishu\test\in2.txt 
+2020/04/30 <20><><EFBFBD><EFBFBD> 18:38:22.64 
+2871
+-----------------------------------------------
+Process exited after 140 ms with return value 0
+
+## z:\Chao\src\1669_nweishu\test\in3.txt 
+2020/04/30 <20><><EFBFBD><EFBFBD> 18:38:22.64 
+4
+-----------------------------------------------
+Process exited after 100 ms with return value 0
+