// Program to find the maximum profit job sequence from a given array 
// of jobs with deadlines and profits 
#include<iostream> 
#include<algorithm> 
using namespace std; 
  
// A structure to represent a job 
struct Job 
{ 
   char id;     // Job Id 
   int dead;    // Deadline of job 
   int profit;  // Profit if job is over before or on deadline 
}; 
  
// This function is used for sorting all jobs according to profit 
bool comparison(Job a, Job b) 
{ 
     return (a.profit > b.profit); 
} 
  
// Returns minimum number of platforms reqquired 
void printJobScheduling(Job arr[], int n) 
{ 
    // Sort all jobs according to decreasing order of prfit 
    sort(arr, arr+n, comparison); 
  
    int result[n]; // To store result (Sequence of jobs) 
    bool slot[n];  // To keep track of free time slots 
  
    // Initialize all slots to be free 
    for (int i=0; i<n; i++) 
        slot[i] = false; 
  
    // Iterate through all given jobs 
    for (int i=0; i<n; i++) 
    { 
       // Find a free slot for this job (Note that we start 
       // from the last possible slot) 
       for (int j=min(n, arr[i].dead)-1; j>=0; j--) 
       { 
          // Free slot found 
          if (slot[j]==false) 
          { 
             result[j] = i;  // Add this job to result 
             slot[j] = true; // Make this slot occupied 
             break; 
          } 
       } 
    } 
  
    // Print the result 
    for (int i=0; i<n; i++) 
       if (slot[i]) 
         cout << arr[result[i]].id << " "; 
} 
  
// Driver code 
int main() 
{ 
    Job arr[] = { {'a', 2, 100}, {'b', 1, 19}, {'c', 2, 27}, 
                   {'d', 1, 25}, {'e', 3, 15}}; 
    int n = sizeof(arr)/sizeof(arr[0]); 
    cout << "Following is maximum profit sequence of jobs \n"; 
    
    // Function call 
    printJobScheduling(arr, n); 
    return 0; 
}
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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
}