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HDOJ/1016_autoAC.cpp

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+#include <iostream>
+#include <cstdio>
+#include <cstdlib>
+using namespace std;
+int ans[25];
+int f[25];
+int n;
+int isprime(int x)
+{
+    for(int i=2;i<=x/2;i++)
+    {
+            if(x%i==0)
+                      return 0;
+    }
+    return 1;
+}
+void dfs(int k,int now)
+{
+    if(k==n)
+    {
+            if(isprime(now+1))
+            {
+                              ans[k]=now;
+                              for(int i=0;i<n;i++)
+                              {
+                                      printf("%d%c",ans[i],i==n-1?'\n':' ');
+                              }
+            }
+            return;
+    }
+    for(int i=2;i<=n;i++)
+    {
+            if(!f[i]&&isprime(now+i))
+            {
+                                     f[i]=1;
+                                     ans[k]=i;
+                                     dfs(k+1,i);
+                                     f[i]=0;
+            }
+    }
+}
+int main()
+{
+    int ncas=1;
+    while(scanf("%d",&n)!=EOF)
+    {
+                              printf("Case %d:\n",ncas++);
+                              memset(f,0,sizeof(f));
+                              ans[0]=1;
+                              dfs(1,1);
+                              putchar('\n');
+    }
+    return 0;
+}