➤ Problem Link : 166E. Tetrahedron
✅ C++ Solution :
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define m 1000000007
int main()
{
ll n;
cin>>n;
ll dp[4];
dp[3]=0;
dp[0]=1;
dp[1]=1;
dp[2]=1;
ll temp1,temp2,temp3,temp4;
for(int i=2;i<=n;i++)
{
temp1=(dp[1]+(dp[2]+dp[3])%m)%m;
temp2=(dp[0]+(dp[2]+dp[3])%m)%m;
temp3=(dp[0]+(dp[1]+dp[3])%m)%m;
temp4=(dp[0]+(dp[2]+dp[1])%m)%m;
dp[0]=temp1;
dp[1]=temp2;
dp[2]=temp3;
dp[3]=temp4;
}
cout<<dp[3];
}
Thank you for your patience reading. If you enjoyed this post, I’d be very grateful if you’d help it spread by emailing it to a friend, or sharing it on Whatsapp or Facebook.
😇Happy Learning!!
I am a Member Technical at D.E. Shaw India Pvt. Ltd. CodingWithArt is a blog where you find tricks and solutions to challenging coding and development problems. I aim to build a universal tech platform for every enthusiast out there.