Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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My question regarding the recursion part:
1. After calling the recursion in void main, the line "for(int j = i; j <= n; j++)" tells us the recursive method will call itself for n times. If I input "5", how come there are 6 total different permutations (or input "6", total = 10, etc.)? If the recursive method gets called n times, shouldnt there be n different permutations?
Transcribed Image Text:Ryuk the shinigami wants to find out the different ways to add up to N apples! For example, if you have 3 apples, the
possible ways are:
3=1+1+1
3=1+2
total=2
Ryuk wants you, to output the solution in the above format given the number of apples, N.
Note: The sequence which you output the solution does not matter, meaning:
3=1+1+1
3=1+2
and
3=1+2
3=1+1+1
are both accepted.
Transcribed Image Text:static int count=0;
static void printOutput(ArrayList<Integer> arr){
count++;
int sum=0;
for (int i=0;i<arr.size();i++){
sum+=arr.get (i);
}
if (arr.size() != 1){
System.out.print(sum+"=");
for(int i=0;i<arr.size()-1;i++){
System.out.print(arr.get(i)+"+");
}
System.out.println(arr.get(arr.size()-1));|
}
}
static void findWays (ArrayList<Integer> arr,int i,int n)
{
if(n==0){
printOutput (arr);
}
for(int i
i; j <= n; j++)
{
arr.add(j);
findways (arr, ji, n: n - j);
arr.remove( index: arr.size() - 1);
}
}
public static void main(String[] args)throws IOException {
BufferedReader br=new BufferedReader(new InputStreamReader (System.in));
int n=Integer.parseInt(br.readLine());
ArrayList<Integer> arr = new ArrayList<>();
findways (arr, : 1,n);
System.out.println("total="+(count-1));
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