503. Next Greater Element II
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Given a circular array (the next element of the last element is the first element of the array), print the Next Greater Number for every element. The Next Greater Number of a number x is the first greater number to its traversing-order next in the array, which means you could search circularly to find its next greater number. If it doesn't exist, output -1 for this number.
Example 1:
Input: [1,2,1]Output: [2,-1,2]Explanation: The first 1's next greater number is 2;
The number 2 can't find next greater number;
The second 1's next greater number needs to search circularly, which is also 2.
Note: The length of given array won't exceed 10000.
首先是双层遍历的方法,复杂度比较高。代码如下:public class Solution { public int[] nextGreaterElements(int[] nums) { int len = nums.length; int max = Integer.MAX_VALUE; int[] res = new int[len]; for (int i = 0; i < len; i ++) { if (nums[i] >= max) { res[i] = -1; continue; } int j = 0; for (j = 1; j < len; j ++) { if (nums[(i + j) % len] > nums[i]) { res[i] = nums[(i + j) % len]; break; } } if (j == len) { res[i] = -1; max = Math.min(max, nums[i]); } } return res; }}第二种方法用stack存下降的子串的index,遇到比peek()大的数就pop()填充res[stack.pop()]。代码如下:
public int[] nextGreaterElements(int[] nums) { int n = nums.length, next[] = new int[n]; Arrays.fill(next, -1); Stack<Integer> stack = new Stack<>(); // index stack for (int i = 0; i < n * 2; i++) { int num = nums[i % n]; while (!stack.isEmpty() && nums[stack.peek()] < num) next[stack.pop()] = num; if (i < n) stack.push(i); } return next;}
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