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统计所有小于非负整数 n 的质数的数量。
示例:
输入: 10 输出: 4 解释: 小于 10 的质数一共有 4 个, 它们是 2, 3, 5, 7 。
一个数如果是质数,那么他的倍数肯定都不是质数
function countPerim(n) { let hash = {}, count = 0; for (let i = 2; i < n; i++) { if (hash[i]) { continue; } count++; for (let j = i; j < n; j = j + i) { hash[j] = true; } } return count; }
The text was updated successfully, but these errors were encountered:
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统计所有小于非负整数 n 的质数的数量。
示例:
解答
一个数如果是质数,那么他的倍数肯定都不是质数
The text was updated successfully, but these errors were encountered: