|| ||Code Submission Evaluation System
CSES Problem Set
Task | Statistics
CSES - School DanceCSES - School Dance
|Time limit:||1.00 s
||Memory limit:||512 MB|
There are $n$ boys and $m$ girls in a school. Next week a school dance will be organized. A dance pair consists of a boy and a girl, and there are $k$ potential pairs.
Your task is to find out the maximum number of dance pairs and show how this number can be achieved.
The first input line has three integers $n$, $m$ and $k$: the number of boys, girls, and potential pairs. The boys are numbered $1,2,\dots,n$, and the girls are numbered $1,2,\dots,m$.
After this, there are $k$ lines describing the potential pairs. Each line has two integers $a$ and $b$: boy $a$ and girl $b$ are willing to dance together.
First print one integer $r$: the maximum number of dance pairs. After this, print $r$ lines describing the pairs. You can print any valid solution.
- $1 \le n,m \le 500$
- $1 \le k \le 1000$
- $1 \le a \le n$
- $1 \le b \le m$
3 2 4