You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in words exactly once and without any intervening characters. For example, giv…
串联选择器:作用在同一个标签上 <div class=”a” id ="qq"><span>look at the color</span></div> css: #qq.a{ …. } 后代选择器:作用在不同标签上 <div id ="qq"><span class=”a”>look at the color</span></div> css: #qq .a{ } 注…
要形成包含多个行的字符串,可以串联两个字符串. 为此,请键入正斜杠,然后按 return 键. 反斜杠导致编译器忽略以下换行符. 例如,字符串 "Long strings can be bro\ ken into two or more pieces." 与字符串是相同的. "Long strings can be broken into two or more pieces." 可以使用字符串串联的任何地方可能以前已使用后跟换行符的反斜杠长输入字符…
