https://leetcode.com/problems/count-the-number-of-ideal-arrays/description 📖 문제 해석 길이가 n인 0‑인덱스 배열 arr가 “이상적(ideal)”이려면 두 가지 조건을 만족해야 합니다. 우리가 구해야 하는 것은 가능한 서로 다른 이상적 배열의 개수이며, 결과는 1_000_000_007으로 나눈 나머지입니다. 간단한 예로 n = 3, maxValue = 4를 생각해 보면, 제약을 보면 n과 maxValue 모두 최대 10<sup>4</sup>로, 단순 완전탐색은 불가능합니다. 🧠 첫 시도와 그 한계 가장…
Link: https://leetcode.com/problems/process-string-with-special-operations-ii/ 📖 Interpreting the Problem We’re given a string s composed of lowercase letters and three special characters: *, #, and %. Each character modifies an initially empty string result as we iterate from left to right. After processing the entire string, we’re to return the k-th character of result (0-based). If k is…
Link: https://leetcode.com/problems/longest-palindromic-path-in-graph/ 📖 Interpreting the Problem We’re given an undirected graph with n nodes, each labeled with a character. Our goal is to find the maximum possible length of a palindrome that can be formed by visiting a sequence of unique nodes along a valid path. Importantly, we may start at any node and travel…
Link: https://leetcode.com/problems/painting-a-grid-with-three-different-colors/ 📖 Interpreting the Problem Imagine you’re handed an empty grid of size m x n, and you need to fill every single cell using one of three colors: red, green, or blue. However, there’s a twist: no two adjacent cells—either vertically or horizontally—can share the same color. Let’s break it down with a…
Link: https://leetcode.com/problems/all-oone-data-structure/description/ 📖 Interpreting the Problem Imagine you’re building a dynamic dictionary of strings where each string has an associated counter. Each time you “see” or “use” a string, its counter increases. If a string is no longer needed, its counter decreases. Occasionally, you’d like to ask: “Which string has the highest count right now?”…
📚 Interpreting the Problem Imagine you’re given a list of limits, where each number in the list represents how many times that index can be used in total. You’re tasked with forming groups using numbers from 0 up to n-1, but with two essential conditions: Your goal is to determine the maximum number of such groups that…