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204:计数质数

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轩辕龙儿 2022-04-12 14:46:03 +08:00
parent 444a999efe
commit 5ff3ff1a86
1 changed files with 36 additions and 1 deletions
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37
src/main/java/leetcode/editor/cn/CountPrimes.java
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@ -45,7 +45,42 @@ public class CountPrimes {
solution.countPrimes(499979);
}
//leetcode submit region begin(Prohibit modification and deletion)
//class Solution {
// public int countPrimes(int n) {
// if (n <= 2) {
// return 0;
// }
// int count = 1;
// for (int i = 3; i < n; i++) {
// if (isPrime(i)) {
// count++;
// }
// }
// return count;
// }
// /**
// * 判断是否是质数
// *
// * @param num 数字
// * @return true：质数、false：不是质数
// */
// private boolean isPrime(int num) {
// if (num < 2) {
// return false;
// }
// if (num == 2) {
// return true;
// }
// for (int i = 2; i * i <= num; i++) {
// if (num % i == 0) {
// return false;
// }
// }
// return true;
// }
//}
class Solution {
public int countPrimes(int n) {
if (n <= 2) {