youwu

1665_chunsu/main.cpp

@@ -1,16 +1,50 @@
-//weiwancheng
+//youwu
+#include <cmath>
 #include <iostream>
 using namespace std;
+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;
+}
 int main()
 {
-    int n,f[10001]={0};
-    cin>>n;
-    f[1]=2;
-    f[2]=3;
-    f[3]=5;
-    f[5]=7;
-    int tou=4,wei=5;
-    do{
+    int n, f[100001] = { 0 }, now = 1, next = 2;
+    bool ans[1000001] = { 0 };
+    cin >> n;
+
+    int tou = 0, wei = 1;
+    do {
         tou++;
-    }while(tou<wei)
+        if (tou == next) {
+            next = wei + 1;
+            now *= 10;
+        }
+        for (int i = 0; i < 10; i++) {
+            int zhe = i * now + f[tou];
+            if (zhe > n) {
+                for (int i = 10; i <= n; i++) {
+                    if (ans[i] == 1) {
+                        cout << i << endl;
+                    }
+                }
+                return 0;
+            }
+            if (pan(zhe) == 1) {
+                f[++wei] = zhe;
+                ans[zhe] = 1;
+            }
+        }
+    } while (tou < wei);
 }

1665_chunsu/test/in.txt

@@ -0,0 +1 @@
+10

1665_chunsu/test/in2.txt

@@ -0,0 +1 @@
+100

1665_chunsu/test/in3.txt

@@ -0,0 +1 @@
+1000000