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23/10/Q260.h

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+//
+// Created by 李洋 on 2023/10/16.
+//
+
+#ifndef LEECODE_C_Q260_H
+#define LEECODE_C_Q260_H
+
+#include <vector>
+#include <map>
+
+using namespace std;
+
+class Q260 {
+public:
+    vector<int> singleNumber(vector<int> &nums) {
+        unordered_map<int, int> m;
+        for (int i: nums) {
+            m[i] = m[i] + 1;
+        }
+        vector<int> ret;
+        for (auto [num, count]: m) {
+            if (count == 1) {
+                if (ret.empty()) {
+                    ret.push_back(num);
+                } else {
+                    ret.push_back(num);
+                    return ret;
+                }
+            }
+        }
+        return ret;
+    }
+};
+
+#endif //LEECODE_C_Q260_H