solve: 0217 Contains Duplicate (C++ set approach)

org/study_deck_02/dsa/arrays-hashing/0217-contains-duplicate.org

@@ -1,5 +1,5 @@
 #+PROPERTY: STUDY_DECK_02
-* TODO 0217. Contains Duplicate :easy:
+* DONE 0217. Contains Duplicate :easy:
 :PROPERTIES:
 :NEETCODE: [[file:../../roadmap.org::*0217. Contains Duplicate][0217. Contains Duplicate]]
 :END:
@@ -38,21 +38,36 @@ All elements are distinct.
 
  - ~-10^{9} <= nums[i] <= 10^{9}~
 
-** TODO Approach
+** DONE Approach
 Write your approach here.
 
-** TODO Python
+** DONE Python
 #+begin_src python
 class Solution:
     def containsDuplicate(self, nums: List[int]) -> bool:
+        s = set()
+        for x in nums:
+            if x in s:
+                return True
+            s.add(x)
+        return False
 #+end_src
 
-** TODO C++
+** DONE C++
 #+begin_src cpp
+#include <vector>
+#include <set>
 class Solution {
 public:
-    bool containsDuplicate(vector<int>& nums) {
-        
+  bool containsDuplicate(std::vector<int>& nums) {
+    std::set<int> s;
+    for (int x: nums) {
+      if (s.contains(x)) {
+        return true;
+      }
+      s.insert(x);
     }
+    return false;
+  }
 };
 #+end_src

org/study_deck_02/roadmap.org

@@ -21,8 +21,15 @@ Source: [[https://neetcode.io/roadmap][neetcode.io/roadmap]]
 Notes: [[file:dsa/arrays-hashing/0217-contains-duplicate.org]]
 ** TODO 0242. Valid Anagram :easy:
 :PROPERTIES:
-:LEETCODE: [[https://leetcode.com/problems/valid-anagram/][Problem]]
-:CPP:      [[https://github.com/neetcode-gh/leetcode/blob/main/cpp/0242-valid-anagram.cpp][Solution]]
+:LEETCODE: [[https://lclass Solution:
+    def containsDuplicate(self, nums: List[int]) -> bool:
+        s = set()
+        for x in nums:
+            if x in s:
+                return True
+            s.add(x)
+        return False
+.com/neetcode-gh/leetcode/blob/main/cpp/0242-valid-anagram.cpp][Solution]]
 :PYTHON:   [[https://github.com/neetcode-gh/leetcode/blob/main/python/0242-valid-anagram.py][Solution]]
 :VIDEO:    [[https://youtube.com/watch?v=9UtInBqnCgA][Watch]]
 :END: