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range gcd queries

Sumit Rawal answered on October 18, 2022 Popularity 3/10 Helpfulness 1/10

answer range gcd queries

range gcd queries

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//User function Template for Java

class Solution
{
    public static int gcd(int a,int b){
        if(a < b){
            int temp = b;
            b=a;
            a=temp;
        }
        
        if(b == 0)
            return a;
            
        return gcd(b,a%b);
    }
    
    //Function to find gcd of given range.
    public static int findRangeGcd(int l, int r, int st[],int n) 
    { 
        //Your code here
        return getLCMR(st,n,l,r,0,n-1,0);
    } 

public static int getLCMR(int st[], int n, int qs, int qe,int ss,int se,int si){
    
    if(se < qs || ss > qe){
        return -1;
    }
    
    if(ss >= qs && se <= qe){
        return st[si];
    }
    
    int mid = (ss+se)/2;
    int lNode = getLCMR(st,n,qs,qe,ss,mid,2*si+1);
    int rNode = getLCMR(st,n,qs,qe,mid+1,se,2*si+2);
    
    if(lNode == -1){
        return rNode;
    }else if(rNode == -1){
        return lNode;
    }
    return gcd(lNode,rNode);
    
}    
    //Function to update a value in input array and segment tree.
    public static void updateValue(int index,int new_val,int arr[],int st[],int n) 
    {
        //Your code here
        if(index >= n || index < 0){
            return;
        }
        arr[index] = new_val;
        updateValueR(arr,st,n,index,new_val,0,n-1,0);
    }
    
    
    



//Function to update a value in input array and segment tree.


public static void updateValueR(int arr[],int st[],int n,int index,long new_val,int ss,int se,int si){

    if(ss > index || se < index){
        return;
    }
    
    if(ss == se){
        st[si] = arr[ss];
        return;
    }
    
    int mid = (ss+se)/2;
    updateValueR(arr,st,n,index,new_val,ss,mid,2*si+1);
    updateValueR(arr,st,n,index,new_val,mid+1,se,2*si+2);
    
    st[si] = gcd(st[2*si+1],st[2*si+2]);
    
}

}

Popularity 3/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: range whatever

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Contributed on Oct 18 2022

Sumit Rawal

0 Answers Avg Quality 2/10

range gcd queries

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