9. Rewrite this function to save appropriate items to the stack: main: addi $a0,
ID: 3599314 • Letter: 9
Question
9. Rewrite this function to save appropriate items to the stack: main: addi $a0, $0, 2 addi $al, $0, 3 addi $a2, $0, 4 addi $a3, $0, 5 jal diffofsums # call Function add $s0, $v0, $0 # y= returned value # argument 0-2 # argument 1-3 # argument 2 = 4 # argument 3-5 $s0 result diffofsums: add $t0, $a0, $a1 # $t0 = f + g add $t1, $a2, $a3 # $t1 = h + i sub $s0, $t0, $t1 # result := (f + g) - (h + i) add $v0, $s0, $0 # put return value in $v0 jr ra #return to callerExplanation / Answer
public class BST { private Node root; // root of BST private class Node { private Key key; // sorted by key private Value val; // associated data private Node left, right; // left and right subtrees private int size; // number of nodes in subtree public Node(Key key, Value val, int size) { this.key = key; this.val = val; this.size = size; } } /** * Initializes an empty symbol table. */ public BST() { } /** * Returns true if this symbol table is empty. * @return {@code true} if this symbol table is empty; {@code false} otherwise */ public boolean isEmpty() { return size() == 0; } /** * Returns the number of key-value pairs in this symbol table. * @return the number of key-value pairs in this symbol table */ public int size() { return size(root); } // return number of key-value pairs in BST rooted at x private int size(Node x) { if (x == null) return 0; else return x.size; } /** * Does this symbol table contain the given key? * * @param key the key * @return {@code true} if this symbol table contains {@code key} and * {@code false} otherwise * @throws IllegalArgumentException if {@code key} is {@code null} */ public boolean contains(Key key) { if (key == null) throw new IllegalArgumentException("argument to contains() is null"); return get(key) != null; } /** * Returns the value associated with the given key. * * @param key the key * @return the value associated with the given key if the key is in the symbol table * and {@code null} if the key is not in the symbol table * @throws IllegalArgumentException if {@code key} is {@code null} */ public Value get(Key key) { return get(root, key); } private Value get(Node x, Key key) { if (key == null) throw new IllegalArgumentException("calls get() with a null key"); if (x == null) return null; int cmp = key.compareTo(x.key); if (cmp < 0) return get(x.left, key); else if (cmp > 0) return get(x.right, key); else return x.val; } /** * Inserts the specified key-value pair into the symbol table, overwriting the old * value with the new value if the symbol table already contains the specified key. * Deletes the specified key (and its associated value) from this symbol table * if the specified value is {@code null}. * * @param key the key * @param val the value * @throws IllegalArgumentException if {@code key} is {@code null} */ public void put(Key key, Value val) { if (key == null) throw new IllegalArgumentException("calls put() with a null key"); if (val == null) { delete(key); return; } root = put(root, key, val); assert check(); } private Node put(Node x, Key key, Value val) { if (x == null) return new Node(key, val, 1); int cmp = key.compareTo(x.key); if (cmp < 0) x.left = put(x.left, key, val); else if (cmp > 0) x.right = put(x.right, key, val); else x.val = val; x.size = 1 + size(x.left) + size(x.right); return x; }Related Questions
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