-
Notifications
You must be signed in to change notification settings - Fork 2
/
1295.统计位数为偶数的数字.html
71 lines (60 loc) · 1.72 KB
/
1295.统计位数为偶数的数字.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>1295. 统计位数为偶数的数字</title>
</head>
<body>
<script>
// https://leetcode.cn/problems/find-numbers-with-even-number-of-digits/
// 给你一个整数数组 nums,请你返回其中位数为 偶数 的数字的个数。
// 提示:
// 1 <= nums.length <= 500
// 1 <= nums[i] <= 10^5
/**
* @param {number[]} nums
* @return {number}
*/
var findNumbers = function (nums) {};
// --- answer-1 ---
// 使用字符串
var findNumbers = function (nums = []) {
return nums.filter((num) => (String(num).length & 1) === 0).length;
};
// --- answer-1 ---
// --- answer-2 ---
// 数学
function numLen(num) {
let res = 0;
while (num) {
num = Math.floor(num / 10);
res += 1;
}
return res;
}
function numLen(num) {
return Math.floor(Math.log10(num)) + 1;
}
var findNumbers = function (nums = []) {
let res = 0;
for (let n of nums) {
const len = numLen(n);
if ((len & 1) === 0) res += 1;
}
return res;
};
// --- answer-2 ---
var nums = [12, 345, 2, 6, 7896];
var result = 2;
// 解释:
var nums = [555, 901, 482, 1771];
var result = 1;
// 解释:
console.log('nums = ', nums);
console.log('result = ', result);
console.log('findNumbers = ', findNumbers(nums));
</script>
</body>
</html>