Which of the following uses memoization? - Data Structures Algorithms Quiz

Data Structures Algorithms - Quiz(MCQ)

Which of the following uses memoization?

Greedy approach

Divide and conquer approach

Dynamic programming approach

None of the above

Correct Answer : Dynamic programming approach

Explanation : Remembering the results of previously calculated solutions is called memoization.

Recently Updated in Data Structures Algorithms Questions

Consider the following code snippet:

void solve(vector<int> &a) { int queries; cin >> queries; while(queries--) { int type; cin >> type; if(type == 1) { int index, value; cin >> index >> value; update(a, index, value); } else { int l, r; cin >> l >> r; cout << getXOR(a, l, r) << endl; } } }

The update() function updates the element at the given index in the array to some given value. The getXOR() function returns the XOR of the elements in the array a, in the range [l, r]. Which of the following data structures can perform the above tasks optimally?

Tries.

Stacks

Prefix XOR Arrays.

Segment Trees.

Correct Answer : Segment Trees.

Consider we have a function, getLCA(), which returns us the Lowest Common Ancestor between 2 nodes of a tree. Using this getLCA() function, how can we calculate the distance between 2 nodes, given that distance from the root, to each node is calculated?

dist(u) + dist(v)

dist(u) + dist(v) - 2 * dist(getLCA(u, v))

dist(u) + dist(v) - dist(getLCA(u, v))

dist(u) + dist(v) + 2 * dist(getLCA(u, v))

Correct Answer : dist(u) + dist(v) - 2 * dist(getLCA(u, v))

Explanation : The distance between 2 nodes, can be broken down into the sum of distances from the root, to each of the nodes. Observe, that in each of these paths, the path from the root to the LCA comes in each of them. So, this needs to be removed from the answer, and hence we get our formula in Option (B).

What will be the output of the following code snippet?

void solve() { deque<int> dq; for(int i = 1; i <= 5; i++) { if(i % 2 == 0) { dq.push_back(i); } else { dq.push_front(i); } } for(auto x: dq) { cout << x << " "; } cout << endl; }

1 2 3 4 5

1 3 5 2 4

5 3 1 2 4

5 4 3 2 1

Correct Answer : 5 3 1 2 4