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This problem involves finding pairs of food items whose sum of deliciousness equals a power of two. The task is to count such pairs modulo (10^9 + 7).
Example
# Inputdeliciousness = [1, 3, 5, 7, 9]# Output# Explanation: Good meals are (1,3), (1,7), (3,5), and (7,9)# Their sums are 4, 8, 8, and 16 respectively (all powers of 2)print(countPairs(deliciousness)) # Output: 4Copied!âś•CopyImplementation
The solution uses a hash map to store the frequency of each value while iterating through the array. For each value, it checks if the complement (to form a power of two) exists in the hash map.
def countPairs(deliciousness):MOD = 10**9 + 7max_power = 2**21 # Maximum power of two within constraintscount_map = {}result = 0for num in deliciousness:power = 1while power <= max_power:complement = power - numif complement in count_map:result += count_map[complement]power *= 2# Update frequency mapcount_map[num] = count_map.get(num, 0) + 1return result % MODCopied!âś•CopyKey Points
Count Good Meals - LeetCode
Count Good Meals - A good meal is a meal that contains exactly two different food items with a sum of deliciousness equal to a power of two. You can pick any two different foods to make a …
1711. Count Good Meals - In-Depth Explanation - AlgoMonster
In-depth solution and explanation for LeetCode 1711. Count Good Meals in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum …
1711. Count Good Meals - LeetCode Wiki
Description A good meal is a meal that contains exactly two different food items with a sum of deliciousness equal to a power of two. You can pick any two different foods to make a good …
1711 - Count Good Meals - Leetcode
Feb 18, 2021 · For each element, obtain all the elements that are greater than or equal to the current element such that the sum of the current element and the other element is a power of …
1711. Count Good Meals - Leetcode Solution - algomap.io
To efficiently count "good meals," we avoid brute-force pair checks by using a hash map to remember how often each value has occurred. For each dish, we look for complements that …
1711. Count Good Meals - LeetCode Solution | SyntaxHut
Problem 1711: Count Good Meals - Detailed explanation and solution approaches. 1711. Count Good Meals LeetCode solution (Medium). Key topics: Array, Hash Table. Time O (n) · Space O …
leetcode-python-solutions/1711. Count Good Meals (Medium) at …
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1711. Count Good Meals - LeetCode Solutions - walkccc.me
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Count Good Meals - LeetCode
Can you solve this real interview question? Count Good Meals - Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your …
LeetCode-Solutions4/Python/count-good-meals.py at master ...
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