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摘要： 很多动态规划问题都可以转化为DAG上的最长路，最短路，或路径计数问题。硬币问题：有N中硬币，面值分别为v1,v2,v3,……vn，每种都无穷多，给定非负整数S，可以选用多少个硬币，使他们的总和恰好为S。输出硬币数目的最小值和最大值。解：每种面值看作一个点，表示：还需要凑足的面值。则开始状态为S，目标... 阅读全文

摘要： Boxes in a LineYou have n boxes in a line on the table numbered 1 . . . n from left to right. Your task is to simulate 4kinds of commands:? 1 X Y : mo... 阅读全文

摘要： Problem BBroken Keyboard (a.k.a. Beiju Text)You're typing a long text with a broken keyboard. Well it's not so badly broken. The only problem with the... 阅读全文

摘要： B. Painting Pebblestime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputThere are n piles of pebbles o... 阅读全文

摘要： Urban ElevationsAn elevation of a collection of buildings is an orthogonal projection of the buildings onto a vertical plane. An external elevation of... 阅读全文

摘要： U - Database Time Limit:9000MS Memory Limit:0KB 64bit IO Format:%lld & %lluSubmit Status Practice UVA 1592Appoint description:DescriptionPeter studies... 阅读全文

摘要： Background from Wikipedia: \Set theory is abranch of mathematics created principally by theGerman mathematician Georg Cantor at the end ofthe 19th cen... 阅读全文

摘要： C. Guess Your Way Out! time limit per test 1 second memory limit per test 256 megabytes input standard input outpu... 阅读全文

摘要： Spreadsheet TrackingData in spreadsheets are stored in cells, which are organized in rows (r) and columns (c). Some operations on spreadsheets can be... 阅读全文

摘要： Some message encoding schemes require that an encoded message be sent in two parts. The first part, called the header, contains the characters o... 阅读全文