#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> integerpair;

vector<vector<integerpair> > bestfirstsearch;

void addedge(int x, int y, int cost)
{
	bestfirstsearch[x].push_back(make_pair(cost, y));
	bestfirstsearch[y].push_back(make_pair(cost, x));
}

void bestfirstsearch19bcn7027(int source, int target, int n)
{
	vector<bool> visited(n, false);

	priority_queue<integerpair, vector<integerpair>, greater<integerpair> > pq;
	pq.push(make_pair(0, source));
	int s = source;
	visited[s] = true;
	cout<<"Aluru Yashaswi Shashank,19BCN7027"<<endl;
	cout<<"Path to Search Items in List from source to given target using best first search:"<<endl;
	while (!pq.empty()) {
		int x = pq.top().second;
		cout << x << " ";
		pq.pop();
		if (x == target)
			break;

		for (int i = 0; i < bestfirstsearch[x].size(); i++) {
			if (!visited[bestfirstsearch[x][i].second]) {
				visited[bestfirstsearch[x][i].second] = true;
				pq.push(make_pair(bestfirstsearch[x][i].first,bestfirstsearch[x][i].second));
			}
		}
	}
}

int main()
{
	
	int v = 14;
	bestfirstsearch.resize(v);


	addedge(0, 1, 13);
	addedge(0, 1, 12);
	addedge(0, 2, 4);
	addedge(1, 3, 7);
	addedge(1, 4, 3);
	addedge(2, 5, 8);
	addedge(2, 6, 2);
	addedge(5, 7, 4);
	addedge(8, 9, 5);
	addedge(6, 8, 9);
	addedge(6, 9, 0);
	

	int source = 0;
	int target = 8;

	
	bestfirstsearch19bcn7027(source, target, v);

	return 0;
}

C++ Online Compiler

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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
}