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13 lines
211 B
C++
13 lines
211 B
C++
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#include<iostream>
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int main()
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{
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using namespace std;
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__int64 a[51]={0,1,2},n;
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for(int i=3;i<=50;i++)
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a[i]=a[i-1]+a[i-2];
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while(cin>>n)
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{
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cout<<a[n]<<endl;
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}
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}
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