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全部文章（共943篇）

【CodeForces - 270C】Magical Boxes （思维，进制，有坑）

题干： Emuskald is a well-known illusionist. One of his trademark tricks involves a set of magical boxes. The essence of the trick is in packing the box...

2018-11-18

0 550

【CodeForces - 271B 】Prime Matrix （素数，预处理打表，思维）

题干： You've got an n × m matrix. The matrix consists of integers. In one move, you can apply a single transformation to the matrix: choose an arbitrar...

2018-11-18

0 676

【CodeForces - 270A】Fancy Fence （几何，思维，水题）

题干： Emuskald needs a fence around his farm, but he is too lazy to build it himself. So he purchased a fence-building robot. He wants the fence to be...

2018-11-18

0 533

【CodeForces - 266B 】Queue at the School （模拟）

题干： During the break the schoolchildren, boys and girls, formed a queue of n people in the canteen. Initially the children stood in the order they en...

2018-11-15

0 423

【CodeForces - 264A】Escape from Stones （模拟，卡精度的处理）

题干： Squirrel Liss lived in a forest peacefully, but unexpected trouble happens. Stones fall from a mountain. Initially Squirrel Liss occupies an inte...

2018-11-15

0 557

【CodeForces - 266C】Below the Diagonal （递归，子问题，贪心模拟）

题干： 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 top to bottom and the col...

2018-11-15

0 511

【POJ - 3342】Party at Hali-Bula（树形dp，最大独立集，是否有唯一解）

题干： 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 invite all my co-workers...

2018-11-15

0 487

【 POJ - 2033 】Alphacode （dp，有坑）

题干： Alice and Bob need to send secret messages to each other and are discussing ways to encode their messages: Alice: "Let's just use a very...

2018-11-15

0 570

【POJ - 3041】Asteroids （二分图，最小点覆盖）

题干： Bessie wants to navigate her spaceship through a dangerous asteroid field in the shape of an N x N grid (1 <= N <= 500). The grid contains ...

2018-11-15

0 453

【HDU - 2376】Average distance （树，平均距离，算贡献）

题干： Given a tree, calculate the average distance between two vertices in the tree. For example, the average distance between two vertices in the foll...

2018-11-15

0 437