Trying to find concurrent times using c++

Question

Given user i out I am trying to figure out how to find out how many concurrent times there are.
// A C++ program to check if any two intervals overlap
#include <algorithm>
#include <iostream>
using namespace std;

// An interval has start time and end time
struct Interval {
    int start;
    int end;
};

// Compares two intervals according to their staring time.
// This is needed for sorting the intervals using library
// function std::sort(). See http:// goo.gl/iGspV
bool compareInterval(Interval i1, Interval i2)
{
    return (i1.start < i2.start) ? true : false;
}

// Function to check if any two intervals overlap
bool isOverlap(Interval arr[], int n)
{
    // Sort intervals in increasing order of start time
    sort(arr, arr + n , compareInterval);

    // In the sorted array, if start time of an interval
    // is less than end of previous interval, then there
    // is an overlap
    for (int i = 1; i < n; i++)
        if (arr[i - 1].end >

Answer 1

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