Merge pull request #70 from codecrafters-io/update-slugs-with-new-names

CC-1227 Update slugs to use new format
codecrafters-io · May 17, 2024 · 602ec95 · 602ec95
2 parents 436ac78 + d64141a
commit 602ec95
Show file tree

Hide file tree

Showing 89 changed files with 15 additions and 15 deletions.
diff --git a/course-definition.yml b/course-definition.yml
@@ -61,7 +61,7 @@ extensions:
 
 stages:
   - legacy_slug: "init"
-    slug: "init"
+    slug: "cq2"
     name: "Match a literal character"
     difficulty: very_easy
     description_md: |-
@@ -91,7 +91,7 @@ stages:
       `a` should match "apple", but not "dog".
 
   - legacy_slug: "match_digit"
-    slug: "match_digit"
+    slug: "oq2"
     name: "Match digits"
     difficulty: very_easy
     description_md: |-
@@ -124,7 +124,7 @@ stages:
       `\d` should match "1", but not "a".
 
   - legacy_slug: "match_alphanumeric"
-    slug: "match_alphanumeric"
+    slug: "mr9"
     name: "Match alphanumeric characters"
     difficulty: very_easy
     description_md: |-
@@ -157,7 +157,7 @@ stages:
       `\w` should match "foo101", but not "$!?".
 
   - legacy_slug: "positive_character_groups"
-    slug: "positive_character_groups"
+    slug: "tl6"
     name: "Positive Character Groups"
     difficulty: medium
     description_md: |-
@@ -188,7 +188,7 @@ stages:
       `[abc]` should match "apple", but not "dog".
 
   - legacy_slug: "negative_character_groups"
-    slug: "negative_character_groups"
+    slug: "rk3"
     name: "Negative Character Groups"
     difficulty: medium
     description_md: |-
@@ -219,7 +219,7 @@ stages:
       `[^abc]` should match "dog", but not "cab" (since all characters are either "a", "b" or "c").
 
   - legacy_slug: "combining_character_classes"
-    slug: "combining_character_classes"
+    slug: "sh9"
     name: "Combining Character Classes"
     difficulty: medium
     description_md: |-
@@ -263,7 +263,7 @@ stages:
       implementation to process user input character-by-character instead of the whole line at once.
 
   - legacy_slug: "start_of_string_anchor"
-    slug: "start_of_string_anchor"
+    slug: "rr8"
     name: "Start of string anchor"
     difficulty: medium
     description_md: |-
@@ -294,7 +294,7 @@ stages:
       `^log` should match "log", but not "slog".
 
   - legacy_slug: "end_of_string_anchor"
-    slug: "end_of_string_anchor"
+    slug: "ao7"
     name: "End of string anchor"
     difficulty: medium
     description_md: |-
@@ -325,7 +325,7 @@ stages:
       `dog$` should match "dog", but not "dogs".
 
   - legacy_slug: "one_or_more_quantifier"
-    slug: "one_or_more_quantifier"
+    slug: "fz7"
     name: "Match one or more times"
     difficulty: hard
     description_md: |-
@@ -352,7 +352,7 @@ stages:
       - `a+` should match "apple" and "SaaS", but not "dog".
 
   - legacy_slug: "zero_or_one_quantifier"
-    slug: "zero_or_one_quantifier"
+    slug: "ny8"
     name: "Match zero or one times"
     difficulty: hard
     description_md: |-
@@ -379,7 +379,7 @@ stages:
       - `dogs?` should match "dogs" and "dog", but not "cat".
 
   - legacy_slug: "wildcard"
-    slug: "wildcard"
+    slug: "zb3"
     name: "Wildcard"
     difficulty: medium
     description_md: |-
@@ -406,7 +406,7 @@ stages:
       - `d.g` should match "dog", but not "cog".
 
   - legacy_slug: "alternation"
-    slug: "alternation"
+    slug: "zm7"
     name: "Alternation"
     difficulty: hard
     description_md: |-
@@ -435,7 +435,7 @@ stages:
   # Backreferences
 
   - legacy_slug: "backreferences-single"
-    slug: "backreferences-single"
+    slug: "sb5"
     primary_extension_slug: "backreferences"
     name: "Single Backreference"
     difficulty: hard
@@ -465,7 +465,7 @@ stages:
       **Example:**
       - `(cat) and \1` should match "cat and cat", but not "cat and dog".
   - legacy_slug: "backreferences-multiple"
-    slug: "backreferences-multiple"
+    slug: "tg1"
     primary_extension_slug: "backreferences"
     name: "Multiple Backreferences"
     difficulty: medium
@@ -489,7 +489,7 @@ stages:
       **Example:**
       - `(\d+) (\w+) squares and \1 \2 circles` should match "3 red squares and 3 red circles" but should not match "3 red squares and 4 red circles".
   - legacy_slug: "backreferences-nested"
-    slug: "backreferences-nested"
+    slug: "xe5"
     primary_extension_slug: "backreferences"
     name: "Nested Backreferences"
     difficulty: hard

diff --git a/solutions/cpp/01-init/code/.gitattributes → solutions/cpp/01-cq2/code/.gitattributes b/solutions/cpp/01-init/code/.gitattributes → solutions/cpp/01-cq2/code/.gitattributes
diff --git a/solutions/cpp/01-init/code/.gitignore → solutions/cpp/01-cq2/code/.gitignore b/solutions/cpp/01-init/code/.gitignore → solutions/cpp/01-cq2/code/.gitignore
diff --git a/solutions/cpp/01-init/code/CMakeLists.txt → solutions/cpp/01-cq2/code/CMakeLists.txt b/solutions/cpp/01-init/code/CMakeLists.txt → solutions/cpp/01-cq2/code/CMakeLists.txt
diff --git a/solutions/cpp/01-init/code/README.md → solutions/cpp/01-cq2/code/README.md b/solutions/cpp/01-init/code/README.md → solutions/cpp/01-cq2/code/README.md
diff --git a/solutions/cpp/01-init/code/codecrafters.yml → solutions/cpp/01-cq2/code/codecrafters.yml b/solutions/cpp/01-init/code/codecrafters.yml → solutions/cpp/01-cq2/code/codecrafters.yml
diff --git a/solutions/cpp/01-init/code/src/Server.cpp → solutions/cpp/01-cq2/code/src/Server.cpp b/solutions/cpp/01-init/code/src/Server.cpp → solutions/cpp/01-cq2/code/src/Server.cpp
diff --git a/solutions/cpp/01-init/code/your_grep.sh → solutions/cpp/01-cq2/code/your_grep.sh b/solutions/cpp/01-init/code/your_grep.sh → solutions/cpp/01-cq2/code/your_grep.sh
diff --git a/...ions/cpp/01-init/diff/src/Server.cpp.diff → ...tions/cpp/01-cq2/diff/src/Server.cpp.diff b/...ions/cpp/01-init/diff/src/Server.cpp.diff → ...tions/cpp/01-cq2/diff/src/Server.cpp.diff
diff --git a/solutions/cpp/01-init/explanation.md → solutions/cpp/01-cq2/explanation.md b/solutions/cpp/01-init/explanation.md → solutions/cpp/01-cq2/explanation.md
diff --git a/solutions/csharp/01-init/code/.gitattributes → solutions/csharp/01-cq2/code/.gitattributes b/solutions/csharp/01-init/code/.gitattributes → solutions/csharp/01-cq2/code/.gitattributes
diff --git a/solutions/csharp/01-init/code/.gitignore → solutions/csharp/01-cq2/code/.gitignore b/solutions/csharp/01-init/code/.gitignore → solutions/csharp/01-cq2/code/.gitignore
diff --git a/solutions/csharp/01-init/code/README.md → solutions/csharp/01-cq2/code/README.md b/solutions/csharp/01-init/code/README.md → solutions/csharp/01-cq2/code/README.md
diff --git a/...arp/01-init/code/codecrafters-grep.csproj → ...harp/01-cq2/code/codecrafters-grep.csproj b/...arp/01-init/code/codecrafters-grep.csproj → ...harp/01-cq2/code/codecrafters-grep.csproj
diff --git a/...csharp/01-init/code/codecrafters-grep.sln → .../csharp/01-cq2/code/codecrafters-grep.sln b/...csharp/01-init/code/codecrafters-grep.sln → .../csharp/01-cq2/code/codecrafters-grep.sln
diff --git a/...ions/csharp/01-init/code/codecrafters.yml → ...tions/csharp/01-cq2/code/codecrafters.yml b/...ions/csharp/01-init/code/codecrafters.yml → ...tions/csharp/01-cq2/code/codecrafters.yml
diff --git a/solutions/csharp/01-init/code/src/Program.cs → solutions/csharp/01-cq2/code/src/Program.cs b/solutions/csharp/01-init/code/src/Program.cs → solutions/csharp/01-cq2/code/src/Program.cs
diff --git a/solutions/csharp/01-init/code/your_grep.sh → solutions/csharp/01-cq2/code/your_grep.sh b/solutions/csharp/01-init/code/your_grep.sh → solutions/csharp/01-cq2/code/your_grep.sh
diff --git a/...s/csharp/01-init/diff/src/Program.cs.diff → ...ns/csharp/01-cq2/diff/src/Program.cs.diff b/...s/csharp/01-init/diff/src/Program.cs.diff → ...ns/csharp/01-cq2/diff/src/Program.cs.diff
diff --git a/solutions/csharp/01-init/explanation.md → solutions/csharp/01-cq2/explanation.md b/solutions/csharp/01-init/explanation.md → solutions/csharp/01-cq2/explanation.md
diff --git a/solutions/go/01-init/code/.gitattributes → solutions/go/01-cq2/code/.gitattributes b/solutions/go/01-init/code/.gitattributes → solutions/go/01-cq2/code/.gitattributes
diff --git a/solutions/go/01-init/code/README.md → solutions/go/01-cq2/code/README.md b/solutions/go/01-init/code/README.md → solutions/go/01-cq2/code/README.md
diff --git a/solutions/go/01-init/code/cmd/mygrep/main.go → solutions/go/01-cq2/code/cmd/mygrep/main.go b/solutions/go/01-init/code/cmd/mygrep/main.go → solutions/go/01-cq2/code/cmd/mygrep/main.go
diff --git a/solutions/go/01-init/code/codecrafters.yml → solutions/go/01-cq2/code/codecrafters.yml b/solutions/go/01-init/code/codecrafters.yml → solutions/go/01-cq2/code/codecrafters.yml
diff --git a/solutions/go/01-init/code/go.mod → solutions/go/01-cq2/code/go.mod b/solutions/go/01-init/code/go.mod → solutions/go/01-cq2/code/go.mod
diff --git a/solutions/go/01-init/code/go.sum → solutions/go/01-cq2/code/go.sum b/solutions/go/01-init/code/go.sum → solutions/go/01-cq2/code/go.sum
diff --git a/solutions/go/01-init/code/your_grep.sh → solutions/go/01-cq2/code/your_grep.sh b/solutions/go/01-init/code/your_grep.sh → solutions/go/01-cq2/code/your_grep.sh
diff --git a/...s/go/01-init/diff/cmd/mygrep/main.go.diff → ...ns/go/01-cq2/diff/cmd/mygrep/main.go.diff b/...s/go/01-init/diff/cmd/mygrep/main.go.diff → ...ns/go/01-cq2/diff/cmd/mygrep/main.go.diff
diff --git a/solutions/go/01-init/explanation.md → solutions/go/01-cq2/explanation.md b/solutions/go/01-init/explanation.md → solutions/go/01-cq2/explanation.md
diff --git a/...tions/haskell/01-init/code/.gitattributes → solutions/haskell/01-cq2/code/.gitattributes b/...tions/haskell/01-init/code/.gitattributes → solutions/haskell/01-cq2/code/.gitattributes
diff --git a/solutions/haskell/01-init/code/.gitignore → solutions/haskell/01-cq2/code/.gitignore b/solutions/haskell/01-init/code/.gitignore → solutions/haskell/01-cq2/code/.gitignore
diff --git a/solutions/haskell/01-init/code/README.md → solutions/haskell/01-cq2/code/README.md b/solutions/haskell/01-init/code/README.md → solutions/haskell/01-cq2/code/README.md
diff --git a/solutions/haskell/01-init/code/app/Main.hs → solutions/haskell/01-cq2/code/app/Main.hs b/solutions/haskell/01-init/code/app/Main.hs → solutions/haskell/01-cq2/code/app/Main.hs
diff --git a/...ons/haskell/01-init/code/codecrafters.yml → ...ions/haskell/01-cq2/code/codecrafters.yml b/...ons/haskell/01-init/code/codecrafters.yml → ...ions/haskell/01-cq2/code/codecrafters.yml
diff --git a/solutions/haskell/01-init/code/package.yaml → solutions/haskell/01-cq2/code/package.yaml b/solutions/haskell/01-init/code/package.yaml → solutions/haskell/01-cq2/code/package.yaml
diff --git a/solutions/haskell/01-init/code/stack.yaml → solutions/haskell/01-cq2/code/stack.yaml b/solutions/haskell/01-init/code/stack.yaml → solutions/haskell/01-cq2/code/stack.yaml
diff --git a/...ions/haskell/01-init/code/stack.yaml.lock → ...tions/haskell/01-cq2/code/stack.yaml.lock b/...ions/haskell/01-init/code/stack.yaml.lock → ...tions/haskell/01-cq2/code/stack.yaml.lock
diff --git a/solutions/haskell/01-init/code/your_grep.sh → solutions/haskell/01-cq2/code/your_grep.sh b/solutions/haskell/01-init/code/your_grep.sh → solutions/haskell/01-cq2/code/your_grep.sh
diff --git a/...ons/haskell/01-init/diff/app/Main.hs.diff → ...ions/haskell/01-cq2/diff/app/Main.hs.diff b/...ons/haskell/01-init/diff/app/Main.hs.diff → ...ions/haskell/01-cq2/diff/app/Main.hs.diff
diff --git a/solutions/haskell/01-init/explanation.md → solutions/haskell/01-cq2/explanation.md b/solutions/haskell/01-init/explanation.md → solutions/haskell/01-cq2/explanation.md
diff --git a/...ns/javascript/01-init/code/.gitattributes → ...ons/javascript/01-cq2/code/.gitattributes b/...ns/javascript/01-init/code/.gitattributes → ...ons/javascript/01-cq2/code/.gitattributes
diff --git a/solutions/javascript/01-init/code/.gitignore → solutions/javascript/01-cq2/code/.gitignore b/solutions/javascript/01-init/code/.gitignore → solutions/javascript/01-cq2/code/.gitignore
diff --git a/solutions/javascript/01-init/code/README.md → solutions/javascript/01-cq2/code/README.md b/solutions/javascript/01-init/code/README.md → solutions/javascript/01-cq2/code/README.md
diff --git a/...tions/javascript/01-init/code/app/main.js → solutions/javascript/01-cq2/code/app/main.js b/...tions/javascript/01-init/code/app/main.js → solutions/javascript/01-cq2/code/app/main.js
diff --git a/.../javascript/01-init/code/codecrafters.yml → ...s/javascript/01-cq2/code/codecrafters.yml b/.../javascript/01-init/code/codecrafters.yml → ...s/javascript/01-cq2/code/codecrafters.yml
diff --git a/...javascript/01-init/code/package-lock.json → .../javascript/01-cq2/code/package-lock.json b/...javascript/01-init/code/package-lock.json → .../javascript/01-cq2/code/package-lock.json
diff --git a/...ions/javascript/01-init/code/package.json → ...tions/javascript/01-cq2/code/package.json b/...ions/javascript/01-init/code/package.json → ...tions/javascript/01-cq2/code/package.json
diff --git a/...ions/javascript/01-init/code/your_grep.sh → ...tions/javascript/01-cq2/code/your_grep.sh b/...ions/javascript/01-init/code/your_grep.sh → ...tions/javascript/01-cq2/code/your_grep.sh
diff --git a/.../javascript/01-init/diff/app/main.js.diff → ...s/javascript/01-cq2/diff/app/main.js.diff b/.../javascript/01-init/diff/app/main.js.diff → ...s/javascript/01-cq2/diff/app/main.js.diff
diff --git a/solutions/javascript/01-init/explanation.md → solutions/javascript/01-cq2/explanation.md b/solutions/javascript/01-init/explanation.md → solutions/javascript/01-cq2/explanation.md
diff --git a/solutions/python/01-init/code/.gitattributes → solutions/python/01-cq2/code/.gitattributes b/solutions/python/01-init/code/.gitattributes → solutions/python/01-cq2/code/.gitattributes
diff --git a/solutions/python/01-init/code/.gitignore → solutions/python/01-cq2/code/.gitignore b/solutions/python/01-init/code/.gitignore → solutions/python/01-cq2/code/.gitignore
diff --git a/solutions/python/01-init/code/Pipfile → solutions/python/01-cq2/code/Pipfile b/solutions/python/01-init/code/Pipfile → solutions/python/01-cq2/code/Pipfile
diff --git a/solutions/python/01-init/code/Pipfile.lock → solutions/python/01-cq2/code/Pipfile.lock b/solutions/python/01-init/code/Pipfile.lock → solutions/python/01-cq2/code/Pipfile.lock
diff --git a/solutions/python/01-init/code/README.md → solutions/python/01-cq2/code/README.md b/solutions/python/01-init/code/README.md → solutions/python/01-cq2/code/README.md
diff --git a/solutions/python/01-init/code/app/main.py → solutions/python/01-cq2/code/app/main.py b/solutions/python/01-init/code/app/main.py → solutions/python/01-cq2/code/app/main.py
diff --git a/...ions/python/01-init/code/codecrafters.yml → ...tions/python/01-cq2/code/codecrafters.yml b/...ions/python/01-init/code/codecrafters.yml → ...tions/python/01-cq2/code/codecrafters.yml
diff --git a/solutions/python/01-init/code/your_grep.sh → solutions/python/01-cq2/code/your_grep.sh b/solutions/python/01-init/code/your_grep.sh → solutions/python/01-cq2/code/your_grep.sh
diff --git a/...ions/python/01-init/diff/app/main.py.diff → ...tions/python/01-cq2/diff/app/main.py.diff b/...ions/python/01-init/diff/app/main.py.diff → ...tions/python/01-cq2/diff/app/main.py.diff
diff --git a/solutions/python/01-init/explanation.md → solutions/python/01-cq2/explanation.md b/solutions/python/01-init/explanation.md → solutions/python/01-cq2/explanation.md
diff --git a/solutions/ruby/01-init/code/.gitattributes → solutions/ruby/01-cq2/code/.gitattributes b/solutions/ruby/01-init/code/.gitattributes → solutions/ruby/01-cq2/code/.gitattributes
diff --git a/solutions/ruby/01-init/code/Gemfile → solutions/ruby/01-cq2/code/Gemfile b/solutions/ruby/01-init/code/Gemfile → solutions/ruby/01-cq2/code/Gemfile
diff --git a/solutions/ruby/01-init/code/Gemfile.lock → solutions/ruby/01-cq2/code/Gemfile.lock b/solutions/ruby/01-init/code/Gemfile.lock → solutions/ruby/01-cq2/code/Gemfile.lock
diff --git a/solutions/ruby/01-init/code/README.md → solutions/ruby/01-cq2/code/README.md b/solutions/ruby/01-init/code/README.md → solutions/ruby/01-cq2/code/README.md
diff --git a/solutions/ruby/01-init/code/app/main.rb → solutions/ruby/01-cq2/code/app/main.rb b/solutions/ruby/01-init/code/app/main.rb → solutions/ruby/01-cq2/code/app/main.rb
diff --git a/solutions/ruby/01-init/code/codecrafters.yml → solutions/ruby/01-cq2/code/codecrafters.yml b/solutions/ruby/01-init/code/codecrafters.yml → solutions/ruby/01-cq2/code/codecrafters.yml
diff --git a/solutions/ruby/01-init/code/your_grep.sh → solutions/ruby/01-cq2/code/your_grep.sh b/solutions/ruby/01-init/code/your_grep.sh → solutions/ruby/01-cq2/code/your_grep.sh
diff --git a/solutions/ruby/01-init/diff/app/main.rb.diff → solutions/ruby/01-cq2/diff/app/main.rb.diff b/solutions/ruby/01-init/diff/app/main.rb.diff → solutions/ruby/01-cq2/diff/app/main.rb.diff
diff --git a/solutions/ruby/01-init/explanation.md → solutions/ruby/01-cq2/explanation.md b/solutions/ruby/01-init/explanation.md → solutions/ruby/01-cq2/explanation.md
diff --git a/solutions/rust/01-init/code/.gitattributes → solutions/rust/01-cq2/code/.gitattributes b/solutions/rust/01-init/code/.gitattributes → solutions/rust/01-cq2/code/.gitattributes
diff --git a/solutions/rust/01-init/code/.gitignore → solutions/rust/01-cq2/code/.gitignore b/solutions/rust/01-init/code/.gitignore → solutions/rust/01-cq2/code/.gitignore
diff --git a/solutions/rust/01-init/code/Cargo.lock → solutions/rust/01-cq2/code/Cargo.lock b/solutions/rust/01-init/code/Cargo.lock → solutions/rust/01-cq2/code/Cargo.lock
diff --git a/solutions/rust/01-init/code/Cargo.toml → solutions/rust/01-cq2/code/Cargo.toml b/solutions/rust/01-init/code/Cargo.toml → solutions/rust/01-cq2/code/Cargo.toml
diff --git a/solutions/rust/01-init/code/README.md → solutions/rust/01-cq2/code/README.md b/solutions/rust/01-init/code/README.md → solutions/rust/01-cq2/code/README.md
diff --git a/solutions/rust/01-init/code/codecrafters.yml → solutions/rust/01-cq2/code/codecrafters.yml b/solutions/rust/01-init/code/codecrafters.yml → solutions/rust/01-cq2/code/codecrafters.yml
diff --git a/solutions/rust/01-init/code/src/main.rs → solutions/rust/01-cq2/code/src/main.rs b/solutions/rust/01-init/code/src/main.rs → solutions/rust/01-cq2/code/src/main.rs
diff --git a/solutions/rust/01-init/code/your_grep.sh → solutions/rust/01-cq2/code/your_grep.sh b/solutions/rust/01-init/code/your_grep.sh → solutions/rust/01-cq2/code/your_grep.sh
diff --git a/solutions/rust/01-init/diff/src/main.rs.diff → solutions/rust/01-cq2/diff/src/main.rs.diff b/solutions/rust/01-init/diff/src/main.rs.diff → solutions/rust/01-cq2/diff/src/main.rs.diff
diff --git a/solutions/rust/01-init/explanation.md → solutions/rust/01-cq2/explanation.md b/solutions/rust/01-init/explanation.md → solutions/rust/01-cq2/explanation.md
diff --git a/...ns/typescript/01-init/code/.gitattributes → ...ons/typescript/01-cq2/code/.gitattributes b/...ns/typescript/01-init/code/.gitattributes → ...ons/typescript/01-cq2/code/.gitattributes
diff --git a/solutions/typescript/01-init/code/.gitignore → solutions/typescript/01-cq2/code/.gitignore b/solutions/typescript/01-init/code/.gitignore → solutions/typescript/01-cq2/code/.gitignore
diff --git a/solutions/typescript/01-init/code/README.md → solutions/typescript/01-cq2/code/README.md b/solutions/typescript/01-init/code/README.md → solutions/typescript/01-cq2/code/README.md
diff --git a/...tions/typescript/01-init/code/app/main.ts → solutions/typescript/01-cq2/code/app/main.ts b/...tions/typescript/01-init/code/app/main.ts → solutions/typescript/01-cq2/code/app/main.ts
diff --git a/solutions/typescript/01-init/code/bun.lockb → solutions/typescript/01-cq2/code/bun.lockb b/solutions/typescript/01-init/code/bun.lockb → solutions/typescript/01-cq2/code/bun.lockb
diff --git a/.../typescript/01-init/code/codecrafters.yml → ...s/typescript/01-cq2/code/codecrafters.yml b/.../typescript/01-init/code/codecrafters.yml → ...s/typescript/01-cq2/code/codecrafters.yml
diff --git a/...ions/typescript/01-init/code/package.json → ...tions/typescript/01-cq2/code/package.json b/...ions/typescript/01-init/code/package.json → ...tions/typescript/01-cq2/code/package.json
diff --git a/...ions/typescript/01-init/code/your_grep.sh → ...tions/typescript/01-cq2/code/your_grep.sh b/...ions/typescript/01-init/code/your_grep.sh → ...tions/typescript/01-cq2/code/your_grep.sh
diff --git a/.../typescript/01-init/diff/app/main.ts.diff → ...s/typescript/01-cq2/diff/app/main.ts.diff b/.../typescript/01-init/diff/app/main.ts.diff → ...s/typescript/01-cq2/diff/app/main.ts.diff
diff --git a/solutions/typescript/01-init/explanation.md → solutions/typescript/01-cq2/explanation.md b/solutions/typescript/01-init/explanation.md → solutions/typescript/01-cq2/explanation.md