Process Execution Time [Shigo Friend Test]

// THINK: A process can start and end at the same time?
vector<int> getTotalExecutionTime(int n, vector<string> logs)
{
    vector<int> startTime(n), endTime(n);
    
    for (string &s: logs) {
        string temp, temp2;
        
        // parse start vector 
        for (char c: s) {
            if (c == ':')
                break;
            
            temp.push_back(c);
        }
        
        // parse end vector
        for (auto it = s.rbegin(); it != s.rend(); it++) {
            if (*it == ':')
                break;
                
            temp2.push_back(*it);
        }
        
        int processNo = stoi(temp);
        reverse(temp.begin(), temp.end());
        // int processTime = stoi(temp2);
        int start_time, end_time;
        
        if (s.contains("start")) {
            start_time = stoi(temp2);
            startTime[processNo] = start_time;   
        }
            
        if (s.contains("end")) {
            end_time = stoi(temp2);
            endTime[processNo] = end_time;
        }
    }
    
    vector<int> ans(n);
    int maxTime = 3e3 + 1;
    
    for (int currTime = 0, runningProcess = -1; currTime < maxTime; currTime++) {
        bool flag = false;
        
        // search in start time
        for (int i = 0; i < n; ++i)
            if (startTime[i] == currTime)
                runningProcess = i;
        
        // search in end time
        for (int i = 0; i < n; ++i)
            if (endTime[i] == currTime)
                flag = true;
        
        
        if (runningProcess >= 0 && runningProcess < n)
            ans[runningProcess]++;
            
        if (flag) {
            flag = false;
            runningProcess = -1;
        }
    }
    
    return ans;
}