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https://github.com/Kiritow/OJ-Problems-Source.git
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15 lines
233 B
C++
15 lines
233 B
C++
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#include <iostream>
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using namespace std;
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int main()
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{
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int n,sum;
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while(cin>>n)
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{
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sum = 0;
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for(int i = 1;i <= n;++i)
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sum += i;
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cout<<sum<<endl<<endl;
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}
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return 0;
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}
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