Answer 1

void sumGivesN(int n){
int sum=0, min=1;
for(int i=1; min<=n/2; ){
if(sum==n){
for(int j=min; j<i; j++) System.out.print(j + " ");
System.out.println();
sum-=min++;
}else if(sum>n) sum-=min++;
else sum+=i++;
}
}