21 lines
292 B
C++
21 lines
292 B
C++
#include<iostream>
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using namespace std;
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int main()
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{
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long double a;
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while(true)
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{
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cin>>a;
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if(a>=0&&a<5) cout<<a+2.5<<endl;
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else
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{
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if(a>=5&&a<10) cout<<2-1.5*(a-3)*(a-3)<<endl;
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else
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{
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if(a>=10&&a<20) cout<<a/2-1.5<<endl;
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else cout<<"ÊäÈëÎÞЧ!"<<endl;
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}
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}
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}
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}
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