题解 | #数列求和#
数列求和
http://www.nowcoder.com/practice/6893484c04c24bfca1f606b1823a468d
public class Main { public static void main(String[] args) {
//write your code here........
long num = 9;
long sum = 0;
for(int i = 1;i <= 10; i++)
{
sum = sum + num;
num = num * 10 + 9;
}
System.out.println(sum);
}
}
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