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#include <iostream>
#include <algorithm>
#include <vector>


using namespace std;

/*
get minimum time, get maximum time
create an array list of size max - min, ledger
iterate throgh times
	iterate from times[0] to times[1]
		ledger[i] ++
		
get max from ledger
return ledgermax
*/

bool cmpMin(const vector<int> &a, const vector<int> &b) {
	  return a[0] < b[0];
}

bool cmpMax(const vector<int> &a, const vector<int> &b) {
	return a[1] > b[1];
}

int laptopRentals(vector<vector<int>> times) {
  int min = (*min_element(times.begin(), times.end(), cmpMin))[0];
	int max = (*max_element(times.begin(), times.end(), cmpMax))[1];
	
	cout << "min " << min << endl;
	cout << "max " << max << endl;
	
	int ledger[max - min] = {0};
	cout << endl;
	for(int i = 0; i < times.size(); i++) {
		for(int j = times[i][0]; j < times[i][1]; j++) {
			ledger[j - min] ++;
			for(int k = 0; k < max - min; k ++) {
			  cout << k + min << ":" << ledger[k] << " ";
			}
			cout << endl;
		}
		cout << endl;
	}
	
	return *max_element(ledger, ledger + max - min);
}

int main()
{
    vector<vector<int>> times = {{0, 2}, {1, 4}, {4, 6}, {0, 4}, {7, 8}, {9, 11}, {3, 10}};
    cout<<laptopRentals(times);

    return 0;
}
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Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}