rails <需要您使用哪个网站获取有关安装的良好内容并为 rails <部署指南的帮助/ em> app。它也可以视频。但我需要好的öne。
答案 0 :(得分：0)
如果你只是谷歌function countSumOfTwoRepresentations2(n, l, r) {
var x = n/2;
var A = Math.floor( x );
var B = Math.ceil( x );
// Every solution is of the form (A - i) + (B + i), where i is an integer >= 0
// How many values of i are valid for l <= (A - i)
var stepsA = A - l + 1;
// How many values of i are valid for (B + i) <= r
var stepsB = r - B + 1;
// If the formulas gave a negative amount of valid steps,
// there is no solution, so return 0
if ( stepsA < 0 || stepsB < 0 )
return 0;
// Otherwise, return the smaller valid amount of steps,
// that is the number of steps that are valid for both A and B
return Math.min(stepsA, stepsB);
}
和你选择的操作系统，那么有很多好的资源。
以下是我个人认为对Ubuntu有用的一些内容：