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https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
23 lines
301 B
C++
23 lines
301 B
C++
#include<iostream>
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using namespace std;
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int f[31];
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void xx()
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{
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f[1]=1;
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f[2]=3;
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for(int i=3;i<=30;++i)
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f[i]=f[i-1]+2*f[i-2];
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}
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int main()
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{
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xx();
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int t,n;
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cin>>t;
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while(t--)
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{
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cin>>n;
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cout<<f[n]<<endl;
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}
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return 0;
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}
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