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30 lines
489 B
C++
30 lines
489 B
C++
//
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// Created by 李洋 on 2023/10/16.
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//
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#ifndef LEECODE_C_Q137_H
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#define LEECODE_C_Q137_H
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#include <vector>
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#include <map>
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using namespace std;
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class Q137 {
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public:
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int singleNumber(vector<int> &nums) {
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unordered_map<int, int> m;
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for (int i: nums) {
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m[i] = m[i] + 1;
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}
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for (auto [num, count]: m) {
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if (count == 1) {
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return num;
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}
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}
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return -1;
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}
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};
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#endif //LEECODE_C_Q137_H
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