2400 - 2499
Solutions categorised by Problem IDs
2400 - Number of Ways to Reach a Position After Exactly k StepsCount walks reaching a target after exactly k unit steps by calculating how many rightward moves the displacement requires.2401 - Longest Nice SubarrayFind the longest subarray whose elements share no set bits by tracking occupied bits in a sliding window.2404 - Most Frequent Even ElementFind the most frequent even value with a frequency map, choosing the smallest value when counts tie.2405 - Optimal Partition of StringMinimize partitions into substrings with distinct letters by starting a new part when a character would repeat.2406 - Divide Intervals Into Minimum Number of GroupsFind the minimum number of nonoverlapping interval groups by sweeping endpoints and measuring the maximum simultaneous overlap.2409 - Count Days Spent TogetherCount days two people spend together by converting dates to day numbers and intersecting their inclusive intervals.2413 - Smallest Even MultipleFind the smallest multiple shared by two and n by checking whether n is already even.2418 - Sort the PeopleOrder people's names by descending height by sorting the paired records or selecting them with a heap.2419 - Longest Subarray With Maximum Bitwise ANDFind the longest subarray attaining the maximum bitwise AND by measuring consecutive runs of the array's largest value.2420 - Find All Good IndicesFind indices surrounded by the required nonincreasing and nondecreasing runs by precomputing lengths on both sides.2421 - Number of Good PathsCount good paths by merging graph components in value order and counting equal-valued endpoints within each component.2425 - Bitwise XOR of All PairingsCompute the XOR of all cross-array pairings by determining whether each element appears an even or odd number of times.2432 - The Employee That Worked on the Longest TaskIdentify the employee who worked the longest single task by comparing differences between successive completion times.2433 - Find The Original Array of Prefix XorRecover the original array by XORing neighboring prefix XOR values to isolate each element.2439 - Minimize Maximum of ArrayMinimize the maximum array value after leftward transfers by examining the rounded-up average of each prefix.2441 - Largest Positive Integer That Exists With Its NegativeFind the largest positive integer whose negative also appears by checking for matching opposite values.2445 - Number of Nodes With Value OneCount tree nodes set to one after subtree flips by carrying the parity of ancestor flips through a depth-first traversal.2455 - Average Value of Even Numbers That Are Divisible by ThreeAverage the even values divisible by three by accumulating their sum and count and rounding down.2461 - Maximum Sum of Distinct Subarrays With Length KFind the maximum sum of a length-k subarray with distinct values by maintaining a running sum and frequency window.2469 - Convert the TemperatureConvert a Celsius temperature into Kelvin and Fahrenheit using the two conversion formulas.2477 - Minimum Fuel Cost to Report to the CapitalMinimize fuel for travel to the capital by combining subtree passenger counts and rounding up the cars needed on each edge.2482 - Difference Between Ones and Zeros in Row and ColumnBuild the difference matrix from row and column counts of ones and zeroes, reusing the totals for every cell.2485 - Find the Pivot IntegerFind the integer whose inclusive left and right sums agree using triangular sums or binary search.2486 - Append Characters to String to Make SubsequenceFind the fewest characters to append by matching the longest possible prefix of the target as a subsequence.2487 - Remove Nodes From Linked ListRemove linked-list nodes with a greater value to their right by tracking candidates with a stack.
