CodeChef --- Jogging

Bismillahir Rahmanir Rahim
///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

ll mod=1000000007,arr[1000009],ans[1000009];

ll dx[] = { -2, -1, 1, 2, -2, -1, 1, 2 };
ll dy[] = { -1, -2, -2, -1, 1, 2, 2, 1 };

int main()
{
    ll sum=1;
    arr[1]=sum;
    for(ll j=1; j<=1000000; j++)
        arr[j]=sum,sum+=arr[j],sum%=mod;
    for(ll j=1; j<=1000000; j++)
        ans[j]+=arr[j],ans[j]%=mod;
    ll tst,n,x;
    cin>>tst;
    while(tst--)
    {
        cin>>n>>x;
        cout<<(ans[n]*x)%mod<<endl;
    }
    return 0;
}
///Alhamdulillah

Problem Link: https://www.codechef.com/START44C/problems/JOGGING

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