/
jump-game-ii.js
59 lines (45 loc) · 950 Bytes
/
jump-game-ii.js
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
/**
* @param {number[]} nums
* @return {number}
*/
// const jump = function (nums) {
// if (!Array.isArray(nums) || nums.length === 0) {
// return -1
// }
// if (nums.length === 1) {
// return 0
// }
// let curJump = nums[0]
// let nextJump = nums[0]
// let step = 1
// for (let i = 1; i < nums.length; i++) {
// if (curJump < i) {
// curJump = nextJump
// step++
// }
// if (nextJump < i + nums[i]) {
// nextJump = i + nums[i]
// }
// if (curJump >= nums.length - 1) {
// return step
// }
// }
// };
const jump = nums => {
let len = nums.length
if (len < 2) return 0
let step = 0
let curReach = 0
let maxReach = 0
let i = 0
while (curReach - (i - 1) > 0) {
step++
while (i <= curReach) {
maxReach = Math.max(maxReach, nums[i] + i)
if (maxReach >= len - 1) return step
i++
}
curReach = maxReach
}
return 0
}