题目大意是求两个关键字严格递增的最长不降序列。
做法和ZJU/ZOJ 1108类似，也是先对一个关键字排序，然后对第二关键字进行DP。不过由于n<=100000所以O(n^2)的DP是肯定会TLE的，只能用O(nlogn)的做法，具体参见ZJU/ZOJ 1108 解题报告。但很奇怪的是如果预处理排序时两个关键字都按降序排序就会WA，第二关键字改成升序就AC了……
3007513 2008-07-26 21:25:55 Accepted 2319 FPC 00:02.26 2368K IwfWcf@LZOI
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