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Count Pairs with Given Sum Video Lecture - Algorithms - Computer Science
FAQs on Count Pairs with Given Sum
| 1. How do you count pairs with a given sum in an array? |  |
Ans. To count pairs with a given sum in an array, you can use a hashmap to store the frequency of elements in the array and then iterate through the array to find pairs that sum up to the target sum.
| 2. Can the array contain negative numbers when counting pairs with a given sum? | |
Ans. Yes, the array can contain negative numbers when counting pairs with a given sum. The algorithm for counting pairs with a given sum can handle both positive and negative numbers.
| 3. What is the time complexity of counting pairs with a given sum using a hashmap? | |
Ans. The time complexity of counting pairs with a given sum using a hashmap is O(n), where n is the number of elements in the array. This is because we only iterate through the array once to find the pairs.
| 4. How can I optimize the algorithm for counting pairs with a given sum? | |
Ans. One way to optimize the algorithm is to sort the array first, which would allow you to use a two-pointer approach to find pairs with a given sum in O(nlogn) time complexity.
| 5. Can I count pairs with a given sum in an array using brute force? | |
Ans. Yes, you can count pairs with a given sum in an array using brute force by iterating through all possible pairs of elements in the array. However, this approach would have a time complexity of O(n^2), which is less efficient compared to using a hashmap or sorting the array.
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Apr 19, 2026 Last updated
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