Translate all code to English (#1836)

* Review the EN heading format. * Fix pythontutor headings. * Fix pythontutor headings. * bug fixes * Fix headings in **/summary.md * Revisit the CN-to-EN translation for Python code using Claude-4.5 * Revisit the CN-to-EN translation for Java code using Claude-4.5 * Revisit the CN-to-EN translation for Cpp code using Claude-4.5. * Fix the dictionary. * Fix cpp code translation for the multipart strings. * Translate Go code to English. * Update workflows to test EN code. * Add EN translation for C. * Add EN translation for CSharp. * Add EN translation for Swift. * Trigger the CI check. * Revert. * Update en/hash_map.md * Add the EN version of Dart code. * Add the EN version of Kotlin code. * Add missing code files. * Add the EN version of JavaScript code. * Add the EN version of TypeScript code. * Fix the workflows. * Add the EN version of Ruby code. * Add the EN version of Rust code. * Update the CI check for the English version code. * Update Python CI check. * Fix cmakelists for en/C code. * Fix Ruby comments
2026-09-02 21:27:14 +00:00 · 2025-12-31 07:44:52 +08:00
parent 45e1295241
commit 2778a6f9c7
1284 changed files with 71557 additions and 3275 deletions
@@ -0,0 +1,46 @@
+=begin
+File: permutations_i.rb
+Created Time: 2024-05-22
+Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
+=end
+
+### Backtracking: permutations I ###
+def backtrack(state, choices, selected, res)
+  # When the state length equals the number of elements, record the solution
+  if state.length == choices.length
+    res << state.dup
+    return
+  end
+
+  # Traverse all choices
+  choices.each_with_index do |choice, i|
+    # Pruning: do not allow repeated selection of elements
+    unless selected[i]
+      # Attempt: make choice, update state
+      selected[i] = true
+      state << choice
+      # Proceed to the next round of selection
+      backtrack(state, choices, selected, res)
+      # Backtrack: undo choice, restore to previous state
+      selected[i] = false
+      state.pop
+    end
+  end
+end
+
+### Permutations I ###
+def permutations_i(nums)
+  res = []
+  backtrack([], nums, Array.new(nums.length, false), res)
+  res
+end
+
+### Driver Code ###
+if __FILE__ == $0
+  nums = [1, 2, 3]
+
+  res = permutations_i(nums)
+
+  puts "Input array nums = #{nums}"
+  puts "All permutations res = #{res}"
+end