[POJ2828] Buy Tickets(待续) 题目大意:多组测试,每组给出\(n\)条信息\((a,b)\),表示\(b\)前面有\(a\)个人,顺序靠后的信息优先级高 Solution.1 由后向前看,每个遇到的都是确定位置的,最后的人选定的位置不会改变,同样因为是倒叙输入,在第\(i\)个人后插队,也就是说他的前面一定要留下\(i\)个空格. 形象一点就是这样: 从后往前,去查找第一个大于所需要空白的位置.用线段树维护空格数目即可 Code.1 #include <iostream>…

/* Buy Tickets Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 10207 Accepted: 4919 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year was…

Buy Tickets Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 19012   Accepted: 9442 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year wa…

Buy Tickets Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 12930   Accepted: 6412 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year wa…

Buy Tickets Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 12296   Accepted: 6071 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue- The Lunar New Year wa…

Buy Tickets Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 22097   Accepted: 10834 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year w…

题目传送门 Buy Tickets Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 22611   Accepted: 11045 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New…

Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year was approaching, but unluckily the Little Cat still had schedules going here and there. Now, he ha…

题目地址:POJ 2828 Buy Tickets Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year was approaching, but unluckily the Little Cat still had schedules going…

http://poj.org/problem?id=2828 首先发现如果我们按照他的方法模拟的话,势必时间爆炸. 所以我们从后往前推,因为我们知道最后一个的位置一定是对的,而前面的位置可以从后面推知. 这样做的好处就是只移动一个元素而不是移动该元素往后的所有元素. 那么怎么查询他应该在第几位就是个问题了. 我们知道线段树怎么写吧. 但是我们不知道线段树的其他功能还有替代部分二叉搜索树的功能. 一个节点表示它的区间内含有的没被插入的位置有多少. 那么我们知道对于一个pos,如果pos小于当前节点…