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

using namespace std;

template<typename T, typename class C= vector<T>>
void print(C c){
  for(auto item: c){
      cout << item << endl;
  }
}


//numbers is an increasing array
vector<int> twoSum(vector<int>& numbers, int target)
{
  int l = 0;
  int r = numbers.size() -1;
  int sum;
  while(l < r){
    sum = numbers[l] + numbers[r];
    if(sum == target) break;
    else if(sum < target) ++l;
    else --r;
  }
  return vector<int>{l+1, r+1};
}


//merge two sorted array
void merge(vector<int>& nums1, int m, vector<int>& nums2, int n){
  int pos = m + n -1;
  m--;
  n--;
  while(m >=0 && n>=0){
    nums1[pos--] = nums1[m] > nums2[n] ? nums1[m--] : nums2[n--];
  }
  
  //if num1 has been merged, do not forget to copy the rest of nums2
  while(n >=0){
    nums1[pos--] = nums2[n--];
  }
}


int main() 
{
    vector<int> nums1{1,2,3,0,0,0};
    int m = 3;
    vector<int> nums2{2,5,6}
    int n = 3;
    print(nums1);
    return 0;
}

created 4 years ago by Michael Miller

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

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
}