16 lines
223 B
C++
16 lines
223 B
C++
#include <iostream>
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using namespace std;
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long long zhao(long long n){
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if(n==1){
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return 1;
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}else{
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return zhao(n-1)*2+2;
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}
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}
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int main()
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{
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int n;
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cin>>n;
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cout<<zhao(n);
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}
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