Number of Students Doing Homework at a Given Time LeetCode solution in C++

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class Solution {
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 public:
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  int busyStudent(vector<int> &startTime, vector<int> &endTime, int queryTime) {
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    int ans = 0;
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    for (int i = 0; i < size(startTime); ++i)
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      if (queryTime >= startTime[i] and queryTime <= endTime[i]) ++ans;
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    return ans;
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  }
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};