#include <bits/stdc++.h>
using namespace std;
typedef vector<tuple<char, int, int>> vt;
typedef vector<pair<int, int>> vp;

// Prints a maximum set of activities that can be done by a single 
// person, one at a time. 
// event   start_time    end_time
//   A         1             3
//   B         2             5
//   C         3             9
//   D         6             8

void printMaxEvents(vt job) {
  for(int i=0;i<job.size();i++) {
    if(i==0) {
      cout<<"Event "<<get<0>(job[i])<<" Start Time: "<<get<1>(job[i])<<" End Time: "<<get<2>(job[i])<<endl; 
      continue;
    }
    // Check if End time of previous event < Start time of current event
    if(get<2>(job[i-1]) <= get<1>(job[i])) {
      cout<<"Event "<<get<0>(job[i])<<" Start Time: "<<get<1>(job[i])<<" End Time: "<<get<2>(job[i])<<endl;
    }
  }
}

bool comparator(tuple<char,int,int> &a, tuple<char,int,int> &b) {
  return get<2>(a)-get<1>(a) < get<2>(b)-get<1>(b);
}

int main() 
{
    vt job;
    job.push_back(make_tuple('A',1,3));
    job.push_back(make_tuple('B',2,5));
    job.push_back(make_tuple('C',3,9));
    job.push_back(make_tuple('D',6,8));
    
    // Sort in ascending order of difference between start & end time
    sort(job.begin(), job.end(), comparator);
    
    // Solution
    printMaxEvents(job); 
    
    // Printing vector tuples 
    for (int i = 0; i < job.size(); i++)  
        cout << get<0>(job[i]) << " " 
             << get<1>(job[i]) << " " 
             << get<2>(job[i]) << "\n"; 
    
    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
}