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- #include <bits/stdc++.h>
- using namespace std;
- using ll=unsigned long long;
- int main(){
- int n,k=0,p=0,w=0;
- cin>>n;
- deque<__int8>v;
- v.push_back(1);
- p=((n-1)*n)/2;
- for(int i=0;i<p;++i){
- w=0;
- for(int j=v.size()-1;j>=0;--j){
- k=v[j]*3+w;
- v[j]=k%10;
- w=k/10;
- }
- if(w!=0)v.push_front(w);
- }
- for(int i:v)cout<<i;
- }
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