题解 | #小乐乐求和#
小乐乐求和
https://www.nowcoder.com/practice/ce0b2eacd3d04647831358c2876e44ff
public class Program {
public static void Main() {
//(1+n)*(n/2)
ulong num = ulong.Parse(System.Console.ReadLine());
ulong result = 0;
while(num!=0)
{
result+=num;
num--;
}
System.Console.WriteLine(result);
}
}
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