LightOj 1082 Array Queries Solution



 LightOj Problem Link: https://lightoj.com/problem/array-queries

Solution in C++:

///La ilaha illellahu muhammadur rasulullah
///******Bismillahir-Rahmanir-Rahim******///
///Abul Hasnat  Tonmoy
///Department of CSE,23rd batch
///Islamic University,Bangladesh
#include <bits/stdc++.h>
#define sf(a) scanf("%d",&a)
using namespace std;
const int MX=1e5+5;
int a[MX],tree[MX*4];
int build(int node,int b,int e)
{
    if(b==e)
        return tree[node]=a[b];
    int mid=(b+e)/2;
    int x=build(node*2,b,mid);
    int y=build(node*2+1,mid+1,e);
    return tree[node]=min(x,y);
}
int query(int node,int b, int e,int l,int r)
{
    if(r<b||l>e)
        return INT_MAX;
    else if(l<=b&&r>=e)
        return tree[node];
    int mid=(b+e)/2;
    int x=query(node*2,b,mid,l,r);
    int y=query(node*2+1,mid+1,e,l,r);
    return min(x,y);
}
int main()
{
    int t,i,j,n,q,x1,y1;
    sf(t);
    for(i=1; i<=t; i++)
    {
        sf(n);
        sf(q);
        for(j=1; j<=n; j++)
            sf(a[j]);
        build(1,1,n);
        printf("Case %d:\n",i);
        while(q--)
        {
            sf(x1);
            sf(y1);
            printf("%d\n",query(1,1,n,x1,y1));
        }
    }
}


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