题目描述:
You are given an array x of n
positive numbers. You start at point (0,0)
and moves x[0]
metres to the north, then x[1]
metres to the west, x[2]
metres to ...
最后更新于 .
You are given an array x of n
positive numbers. You start at point (0,0)
and moves x[0]
metres to the north, then x[1]
metres to the west, x[2]
metres to ...
最后更新于 .
LeetCode 334. Increasing Triplet Subsequence
Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array.
Formally the function should:
Return true if there exists i, j, k
such that arr[i ...
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LeetCode 332. Reconstruct Itinerary
Given a list of airline tickets represented by pairs of departure and arrival airports [from, to]
, reconstruct the itinerary in order. All of the tickets belong to a man who departs from JFK
. Thus, the ...
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数组洗牌是指将一个数组中的元素顺序打乱,随机重新排列。
算法实现思路如下:
按照下标从大到小的顺序遍历数组,记下标为i 遍历时生成范围[0, i]的随机数j,交换下标i与下标j的数组元素
参考:java.util.Collections
类中的shuffle
方法
public static void shuffle(int[] nums) {
Random rnd = new Random();
for (int i = nums.length - 1; i > 0; i--) {
int j ...
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LeetCode 331. Verify Preorder Serialization of a Binary Tree
One way to serialize a binary tree is to use pre-oder traversal. When we encounter a non-null node, we record the node's value. If it is a null node, we ...