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) {
String a = "9";
long sum = 0;
for(int i = 0;i<10;i++){
sum = Long.parseLong(a) + sum;
a = a + "9";
}
System.out.println(sum);
}
}
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