이슈 #402에서 솔루션 추가

Programmers/같은_숫자는_싫어.cpp

@@ -0,0 +1,27 @@
+#include <vector>
+#include <iostream>
+#include <stack>
+#include <algorithm>
+
+using namespace std;
+
+vector<int> solution(vector<int> arr) {
+    stack<int> s;
+    vector<int> result;
+
+    s.push(arr[0]);
+    for (int num : arr) {
+        if (s.top() != num) {
+            s.push(num);
+        }
+    }
+
+    while (!s.empty()) {
+        result.push_back(s.top());
+        s.pop();
+    }
+
+    reverse(result.begin(), result.end());
+
+    return result;
+}