经验法则:在颜色不相邻的时候加上背景颜色颜色的个数为6~12比较好。 颜色其实很大程度上由背景决定而不是他本身决定。
D3 Scale-Chromatic 有许多颜色刻度,可以根据自己的需要进行选择。
参考论文:Practical Rules for Using Color in Cha…
题目描述
Given an integer array nums, return the number of range sums that lie in [lower, upper] inclusive. Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j (i ≤ j), inclusive.
Note: A naive algorithm of O(n2) is t…
给服务器重装了一下系统,结果报了上述错误: WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
...在网上找…