'commit'

TangDou/KaoShi/埃拉筛.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+const int INF = 0x3f3f3f3f;
+const int N = 1e5 + 10;
+int primes[N], cnt; // primes[]存储所有素数
+bool st[N];         // st[x]存储x是否被筛掉
+//埃拉筛
+void get_primes(int n) {
+    for (int i = 2; i <= n; i++)
+        if (!st[i]) {
+            primes[cnt++] = i;                  //记录素数
+            for (int j = 2 * i; j <= n; j += i) //成倍数的标识
+                st[j] = true;
+        }
+}
+/*
+ get_primes(200);
+    for (int i = 0; i < cnt; i++)
+        if (primes[i] > 100)
+cout << primes[i] << " ";
+*/
+int main() {
+    return 0;
+}