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Create yeongu.cpp
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contains-duplicate/yeongu.cpp

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class Solution {
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public:
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bool containsDuplicate(vector<int>& nums) {
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set<int> unique;
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for (int i : nums) {
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if (unique.find(i) != unique.end()) {
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return true;
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}
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unique.insert(i);
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}
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return false;
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}
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};

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