The problem involves maximizing a score by strategically playing tokens either face-up (spending power to gain score) or face-down (spending score to gain power). The solution involves sorting the tok

Summary: The problem involves determining the number of columns to delete from a grid of strings to ensure all remaining columns are sorted lexicographically. The solution iterates through each column

Summary: The problem checks if an array is a valid mountain array, which must: Have length ≥ 3 Strictly increase to a peak (not at the ends) Strictly decrease after the peak End at the last element Ap

Abstract: Given a set of points on a plane, calculate the minimum area of ​​a rectangle formed by these points with sides parallel to the coordinate axes. If no such rectangle exists, return 0. Soluti

This problem involves reordering log files based on specific criteria. The solution separates logs into letter-logs (containing letters after the identifier) and digit-logs (containing digits). Letter

The problem involves tracking recent requests within a 3000-millisecond window. The solution uses a RecentCounter class with a dynamically expanding array to store request timestamps. The key optimiza

This problem requires counting the number of distinct email addresses that actually received the emails. The processing rules include:The period ('.') in the locale name is ignored; for example, "alic

Approach The problem involves minimizing the spread of malware in a network by removing one initially infected node. The solution involves simulating the removal of each infected node and calculating

Summary: The problem requires converting a binary string into a monotone increasing sequence (all 0s followed by all 1s) with the minimum number of flips. The solution involves scanning the string whi

This problem requires calculating the number of music playlists that meet certain conditions. Given n different songs, you need to create a playlist of length goal, where each song is played at least