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

You are given an array A of integers of size N. You will be given Q queries where each query is represented by two integers L, R.
You have to find the gcd(Greatest Common Divisor) of the array
after excluding the part from range L to R inclusive (1 Based indexing).
You are guaranteed that after excluding the part of the array remaining array is non empty.

Input
First line of input contains an integer T denoting number of test cases.
For each test case, first line will contain two space separated integers N, Q.
Next line contains N space separated integers denoting array A.
For next Q lines, each line will contain a query denoted by two space separated integers L, R.
Output
For each query, print a single integer representing the answer of that query.
Constraints
Subtask #1: 40 points

2 ≤ T, N ≤ 100, 1 ≤ Q ≤ N, 1 ≤ A[i] ≤ 105
1 ≤ L, R ≤ N and L ≤ R
Subtask #2: 60 points

2 ≤ T, N ≤ 105, 1 ≤ Q ≤ N, 1 ≤ A[i] ≤ 105
1 ≤ L, R ≤ N and L ≤ R
Sum of N over all the test cases will be less than or equal to 106.
Example
Input:
1
3 3
2 6 9
1 1
2 2
2 3

Output:
3
1
2
 
*/



int main() 
{
    
    int t;
    cin>>t;
    
    while(t--){
      
      int n,q;
      cin >> n >> q;
      
      int a[n],i;
      
      for(i=1; i<=n; i++){
        
        cin >> a[i];
      }
      
      while(q--){
        
        int l,r;
        cin >> l >> r;
        
        int gc=0;
        
        for(i=1; i<=l-1; i++){
          gc = __gcd( gc , a[i]) ;
        }

        for(i=r+1; i<=n; i++){
          gc = __gcd( gc , a[i]) ;
        }
        
        cout << gc << endl;
        
      }
      
    }
    
    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
}