原创 【Codeforces-140C】New Year Snowmen（貪心+優先隊列、二分）
As meticulous Gerald sets the table and caring Alexander sends the postcards, Sergey makes snowmen. Each showman should
2018-11-28 12:59:32
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原创 【CodeForces - 305C】Ivan and Powers of Two（思維）
C. Ivan and Powers of Two time limit per test 0.5 seconds memory limit per test 256 megabytes input standard input outp
2018-11-28 12:59:32
原创 【CodeForces - 122B】Lucky Substring（思維）
Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contai
2018-11-26 08:50:28
原创 【CodeForces - 288B】Polo the Penguin and Houses （組合數學+Purfer序列）
Little penguin Polo loves his home village. The village has n houses, indexed by integers from 1 to n. Each house has a
2018-11-26 08:50:28
1
原创 【CodeForces - 514B】Han Solo and Lazer Gun
There are n Imperial stormtroopers on the field. The battle field is a plane with Cartesian coordinate system. Each sto
2018-11-26 08:50:28
原创 【CodeForces - 288C】Polo the Penguin and XOR operation （思維、異或運算）
Little penguin Polo likes permutations. But most of all he likes permutations of integers from 0 to n, inclusive. For p
2018-11-26 08:50:28
1
原创 【nowcoder】出裝方案（二分圖匹配/最小費用最大流）
題目鏈接 鏈接：https://ac.nowcoder.com/acm/contest/283/F 來源：牛客網 時間限制：C/C++ 1秒，其他語言2秒 空間限制：C/C++ 32768K，其他語言65536K 64bit IO F
2018-11-26 08:50:28
原创 【SPOJ - SCITIES】Selfish Cities（最小費用最大流）
Far, far away there is a world known as Selfishland because of the nature of its inhabitants. Hard times have forced th
2018-11-26 08:50:28
原创 【POJ - 2135】Farm Tour（最小費用最大流）
When FJ's friends visit him on the farm, he likes to show them around. His farm comprises N (1 <= N <= 1000) fields num
2018-11-26 08:50:27
原创 【CodeForces - 76D】Plus and xor（位運算-異或）
Bitwise exclusive OR (or bitwise addition modulo two) is a binary operation which is equivalent to applying logical exc
2018-11-26 08:50:27
原创 【nyoj-127】星際之門（一）（Cayley公式 / Prufer序列）
星際之門（一） 時間限制：3000 ms | 內存限制：65535 KB 難度：3 描述 公元3000年，子虛帝國統領着N個星系，原先它們是靠近光束飛船來進行旅行的，近來，X博士發明了星際之門，它利用蟲洞技術，一條蟲洞可以連通任意的兩
2018-11-26 08:50:27
原创 【CodeForces - 266C】Below the Diagonal（模擬）
You are given a square matrix consisting of n rows and n columns. We assume that the rows are numbered from 1 to n from
2018-11-20 09:16:54
原创 【HDU - 2376】Average distance （樹上任意兩點之間的距離之和的平均值、計算結點的貢獻度）
Given a tree, calculate the average distance between two vertices in the tree. For example, the average distance betwee
2018-11-20 09:16:54
原创 【POJ - 3342】Party at Hali-Bula （樹形dp+判斷）
Dear Contestant, I'm going to have a party at my villa at Hali-Bula to celebrate my retirement from BCM. I wish I could
2018-11-20 09:16:54
原创 【POJ - 1655】Balancing Act （樹的重心）
Consider a tree T with N (1 <= N <= 20,000) nodes numbered 1...N. Deleting any node from the tree yields a forest: a co
2018-11-20 09:16:54