这个答案要求lo>hi,
private static int sum(int lo, int hi){
if(lo>hi){
return 0;
}
if(lo == hi) return lo;
return lo + hi + sum(lo+1, hi-1);
}
这个答案要求lo>hi,
private static int sum(int lo, int hi){
if(lo>hi){
return 0;
}
if(lo == hi) return lo;
return lo + hi + sum(lo+1, hi-1);
}