poj 2452
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Sticks Problem
Time Limit: 6000MS Memory Limit: 65536KTotal Submissions: 7061 Accepted: 1719
Description
Xuanxuan has n sticks of different length. One day, she puts all her sticks in a line, represented by S1, S2, S3, ...Sn. After measuring the length of each stick Sk (1 <= k <= n), she finds that for some sticks Si and Sj (1<= i < j <= n), each stick placed between Si and Sj is longer than Si but shorter than Sj.
Now given the length of S1, S2, S3, …Sn, you are required to find the maximum value j - i.
Now given the length of S1, S2, S3, …Sn, you are required to find the maximum value j - i.
Input
The input contains multiple test cases. Each case contains two lines.
Line 1: a single integer n (n <= 50000), indicating the number of sticks.
Line 2: n different positive integers (not larger than 100000), indicating the length of each stick in order.
Line 1: a single integer n (n <= 50000), indicating the number of sticks.
Line 2: n different positive integers (not larger than 100000), indicating the length of each stick in order.
Output
Output the maximum value j - i in a single line. If there is no such i and j, just output -1.
Sample Input
45 4 3 646 5 4 3
Sample Output
1-1
Source
POJ Monthly,static
分析:二分+rmq,暴力貌似也能过。。。⊙﹏⊙b汗
添加线段树与队列两种方法
线段树:
队列(想出来竟然和某牛一致,懒得敲代码,copy+优化。。。):
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