Hello! I'm new here, but for a long time following this forum. I got task for some project to do, but I really don't know how to start. If someone can help me, I would be grateful. I didn't do anything. I don't realize this task and I don't know how to start, I don't know what I need to do in this task, or anything. I need the whole code. If anyone can solve this, please help me, it's an emergency. ___________________________ You are given N open intervals on a line (the intervals do not include their endpoints). Your task is to write a program which finds the largest number of intervals that can be chosen so they don't intersect. INPUT: The first line of the standard input contains a number N (0<N<=5000), the number of intervals. The next N lines contain two integers li and ri (-10000< li < di <10000) which represent the left and right ends of the interval (1<=i<=N). OUTPUT: To the standard output in one line write the number of intervals which can be chosen so that they do not intersect. Input: 4 -1 1 0 5 2 3 5 9 Output: 3 P.S. The program is required to implement function, which checks whether two intervals have a common point: bool check (int beg1, int end1, int beg2, int end2).I am suffering with this for a long time and I can not resolve it, the task should be solved using the iostream library.

c++ is a bit advanced for me, but I *think* you can use a vector declare a 2d vector Code: std::vector<std::vector<int> > intervals; add some data Code: loop(while input is stored) { intervals.push_back(std::vector<int>(2)); // prepare a set of end pts // request end pt 1 and end pt 2 std::cin >> intervals[loop_counter][0] // end pt 1 std::cin >> intervals[loop_counter][1] // end pt 2 } I *think* the function would want to check intervals[0][0], intervals[0][1] against the other sets in the vector, so use a loop starting at index pos 1 Code: for(int i=1; i < intervals.size(); ++i) { if(check(intervals[0][0], intervals[0][1], intervals[i][0], intervals[i][1]) == false) ++count; } oops; forgot the function Code: bool check(int s1, int e1, int s2, int e2) { return (s2 >= s1 && e2 <= e1); } maybe something like that. HTH