题解 | #求1+2+3+...+n#
求1+2+3+...+n
http://www.nowcoder.com/practice/7a0da8fc483247ff8800059e12d7caf1
public class Solution {
public int Sum_Solution(int n) {
// &&短路运算
boolean b = n > 1 && (n = (1+n)*n/2) > 0;
return n;
}
} 