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全部文章（共238篇）

Codeforces427E Police Patrol

http://codeforces.com/problemset/problem/427/E Imagine that your city is an infinite 2D plane with Cartesian coordinate system. The only crime-affect...

2019-03-28

0 532

Codeforces421C Online Meeting

http://codeforces.com/problemset/problem/421/C Nearly each project of the F company has a whole team of developers working on it. They often are in d...

2019-03-28

0 589

Codeforces 425 A Sereja and Swaps

http://codeforces.com/problemset/problem/425/A As usual, Sereja has array a, its elements are integers: a[1], a[2], ..., a[n]. Let's introduce notati...

2019-03-27

0 891

Codeforces405D Toy Sum

http://codeforces.com/contest/405/problem/D Little Chris is very keen on his toy blocks. His teacher, however, wants Chris to solve more problems, so...

2019-03-22

0 470

Codeforces403B Upgrading Array

http://codeforces.com/contest/403/problem/B You have an array of positive integers a[1], a[2], ..., a[n] and a set of bad prime numbers b1, b2, ..., ...

2019-03-22

0 552

?OJ 集合子集不能拼出的最小数

题意：给定一个集合，求不能由该集合子集拼出的最小数。样例： {2,5,1} 1，2，3均可以拼出，4不能拼出，故答案是4. 思路：先把集合元素从小到大排序，首先，假设第1个数必须是1，否则答案就是1. 归纳法假证： x=1时可以拼出1.（第1项满足）对于任意x(x>=...

2019-03-22

0 584

Codeforces 404E Maze 1D

http://codeforces.com/contest/404/problem/E Valera has a strip infinite in both directions and consisting of cells. The cells are numbered by integer...

2019-03-21

0 579

Codeforces414C Mashmokh and Reverse Operation

http://codeforces.com/contest/414/problem/C Mashmokh's boss, Bimokh, didn't like Mashmokh. So he fired him. Mashmokh decided to go to university and ...

2019-03-20

0 547

Codeforces414D. Mashmokh and Water Tanks

http://codeforces.com/problemset/problem/414/D Mashmokh is playing a new game. In the beginning he has k liters of water and p coins. Additionally he...

2019-03-20

0 791

Codeforces402E Strictly Positive Matrix

http://codeforces.com/problemset/problem/402/E You have matrix a of size n × n. Let's number the rows of the matrix from 1 to n from top to bottom, l...

2019-03-17

0 470