'commit'

2025-08-30 18:35:01 +08:00
commit 1f397eca87
6258 changed files with 1487241 additions and 0 deletions
--- a/C++专题课程/质数相关/IsPrime.cpp
+++ b/C++专题课程/质数相关/IsPrime.cpp
@@ -0,0 +1,34 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+// 1<><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20>ж<EFBFBD>n<EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>
+bool is_prime(int n) {
+    if (n < 2)
+        return false;
+    for (int i = 2; i < n; ++i)
+        if (n % i == 0)
+            return false;
+    return true;
+}
+
+//2 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ż<EFBFBD><C5BB><EFBFBD><EFBFBD><EFBFBD>
+bool is_prime2(int n) {
+    if (n < 2)
+        return false;
+    /**
+     * ֻ<><D6BB>Ҫ<EFBFBD>жϵ<D0B6><CFB5><EFBFBD><EFBFBD><EFBFBD>n<EFBFBD><6E><EFBFBD>ɣ<EFBFBD><C9A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫʹ<D2AA><CAB9>С<EFBFBD>ڵ<EFBFBD><DAB5>ڷ<EFBFBD><DAB7><EFBFBD>
+     * <20><><EFBFBD><EFBFBD><EFBFBD>ܽ<EFBFBD><DCBD><EFBFBD>ʹ<EFBFBD><CAB9>С<EFBFBD>ڷ<EFBFBD><DAB7>ţ<EFBFBD><C5A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>9<EFBFBD><39>
+     **/
+    for (int i = 2; i * i <= n; ++i)
+        if (n % i == 0)
+            return false;
+    return true;
+}
+
+int main() {
+    for (int i = 2; i < 1000; i++) {
+        cout << i << ":" << is_prime2(i) << endl;
+    }
+    return 0;
+}