# Leetcode 2103: Rings and Rods

2 min readJan 21, 2022

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In this problem, we are given a list of rings going into rods, and we should return how many rods have rings with all the possible colors.

There are

`n`

rings and each ring is either red, green, or blue. The rings are distributedacross ten rodslabeled from`0`

to`9`

.

You are given a string`rings`

of length`2n`

that describes the`n`

rings that are placed onto the rods. Every two characters in`rings`

forms acolor-position pairthat is used to describe each ring where:

Thefirstcharacter of the`ith`

pair denotes the`ith`

ring'scolor(`'R'`

,`'G'`

,`'B'`

).

Thesecondcharacter of the`ith`

pair…