## [CodeJam 2021 Round 3] Square Free

problem
Shinaiko is an old woman who loves playing mahjong. One day she put her mahjong into a
n
×
m
n\times m
n × In the grid diagram of m, each mahjong can be placed in the grid obliquely to the left (e.g ...

Posted on *Tue, 16 Nov 2021 09:18:29 -0500* by **egalp**

## BZOJ 3275.Number -- bipartite graph, minimum cut of network flow

Title Description
There are N positive integers. You need to select some numbers from them to maximize the sum of these numbers. If two numbers a and B meet the following conditions at the same time, a and B cannot be selected at the same time 1: There is a positive integer C, so that a*a+b*b=c*c 2:gcd(a,b)=1 n≤3000
Problem solution
We can e ...

Posted on *Sat, 06 Nov 2021 10:42:30 -0400* by **Vasudhevan**

## Selected miscellaneous questions (Fate Trilogy)

How difficult it is to find three questions about \ (fat \) in a world full of cadoli
Today's meal at Emiya's house
A very good inclusion exclusion + \ (dp \) problem
Considering the third limitation, it is found that at most one column is illegal, so we can enumerate which column is illegal
Then the next task is to find the total number of sch ...

Posted on *Thu, 28 Oct 2021 18:47:03 -0400* by **newbiehacker**

## YBTOJ: turret attack (network flow)

Title Description
Xiao Ming is playing a very interesting game recently. The rules of the game are as follows:
There is one
n
∗
m
n*m
n * m map. Every position on the map is either an open space, or a turret, or some ...

Posted on *Mon, 20 Sep 2021 21:30:09 -0400* by **JimBadger**