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) {
int res =n;
boolean flag=(n>0)&&(res+=Sum_Solution(n-1))>0;
return res;
}
} 
