人生的旅途像一个树模型, 我们时时刻刻都面临着选择, 即每个选择点都有n个分支；但是人生的旅途更像一个有着拓扑结构的图模型，起点是我们诞生的时刻，而终点就是我们离开之时。旅途之中，我们都有着自己的算法思想，去计算自己的得失；古往今来，有些人致力于寻找到达终点的最长路径(他们想着长寿，甚至长身不老。。。很可惜，寻找最长路径是NP难问题)；有些人致力于寻找到达某个点的最短路径(寻求成功的捷径，也许有吧。。。但一般是有经验的老者，在回首往事之时发现的东东)。在面临人生的各种选择时，更多的人乐意（或许是自觉不自觉的）选择了贪心思想， 贪婪的选择目前给自己带来最大的名与利的路径，而忽略了以后的得与失；但是也有很多人有着动态规划的思想，他们能动态的规划自己的人生，做出正确的选择。然而，人生不是一道算法题，人生的旅途也不是一个拓扑结构图，无法预先知道任何一条路径的得与失。有时也许贪心更适合我们，这种思想单纯直接，即便是凸显了人性的弱点，但是我们能很快的明确自己的目标，有的放矢；然而，有时我们真应该静下心来冥想，去审视自己目前所追逐的目标，衡量一个得与失，动态的去选择正确的目标，以免到最后把自己伤的体无完肤。这里添上一首经典的英文诗歌，朴实的词句道出了人生的真谛：
The Road Not Taken
Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth;
Then took the other, as just as fair,
And having perhaps the better claim,
Because it was grassy and wanted wear;
Though as for that the passing there
Had worn them really about the same,
And both that morning equally lay
In leaves no step had trodden black.
Oh, I kept the first for another day!
Yet knowing how way leads on to way,
I doubt if I should ever come back.
I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I—
I took the ones less traveled by,
And that has made all the difference.
尤其是最后一句，I took the ones less traveled by，And that has made all the difference，坚信自己的选择能使自己与众不同。