 #include <bits/stdc++.h>
using namespace std;

void subsetSum(vector<int> w, vector<int> x, int n, int m, int i, int sum, int total) {
    // Base Case
      if(sum==m) {
        for(auto val=x.begin(); val!=x.end(); val++) {
          if(*val!=0)
            cout<<w[val-x.begin()]<<" + ";
        }
        cout<<"= 30\n";
      }
      if(i==n) {
        return; 
      }
    
    cout<<i<<"\t"<<sum<<"\t"<<total<<"\t"<<endl;
    
    // Bounding Condition
    if(sum<m && sum+total>m) {
      // Including w[i]
      x.insert(x.begin()+i, 1);
      subsetSum(w, x, n, m, i+1, sum+=w[i], total-=w[i]);
      
      // Excluding w[i]
      x.insert(x.begin()+i, 0);
      subsetSum(w, x, n, m, i+1, sum, total-=w[i]);
    }
    // x.assign(n,0);
    return;
}

int main() 
{
    vector<int> w{5,10,12,13,15,18};
    int total = accumulate(w.begin(), w.end(), 0);
    int n=w.size();
    vector<int> x(n,0);
    int m=30;
    subsetSum(w, x, n, m, 0, 0, total);
    return 0;
}

created 4 years ago by khuzema khomosi

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Read inputs from stdin

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#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
}