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Practice › LeetCode › LeetCode 20xx ›

LeetCode 2097 - Valid Arrangement of Pairs

LeetCode Problem 2097 Difficulty: 🔴 Hard Topics: Array, Depth-First Search, Graph Theory, Eulerian Circuit Solution LeetCode 2097 - Valid Arrangement of Pairs Problem Understanding This problem gives us a list of directed pairs, where each pair [starti, endi] represents a directed edge from starti to endi . We must rearrange all pairs so that adjacent pairs connect correctly. More specifically, if the arrangement is: [a, b], [c, d], [e, f]...
leetcode Hard array depth-first-search graph-theory eulerian-circuit May 29, 2026
Practice › LeetCode › LeetCode 07xx ›

LeetCode 753 - Cracking the Safe

LeetCode Problem 753 Difficulty: 🔴 Hard Topics: String, Depth-First Search, Graph Theory, Eulerian Circuit Solution Problem Understanding This problem asks us to generate the shortest possible string that guarantees a safe will unlock at some point while typing it. The safe password has exactly n digits, and each digit can be any value from 0 to k - 1 . The safe does not validate the entire entered sequence at...
leetcode Hard string depth-first-search graph-theory eulerian-circuit May 28, 2026
Practice › LeetCode › LeetCode 03xx ›

LeetCode 332 - Reconstruct Itinerary

LeetCode Problem 332 Difficulty: 🔴 Hard Topics: Array, String, Depth-First Search, Graph Theory, Sorting, Heap (Priority Queue), Eulerian Circuit Solution Problem Understanding The problem is asking us to reconstruct a flight itinerary given a list of tickets. Each ticket is a one-way flight represented as a pair of airport codes [from, to] . The traveler always starts at "JFK" , and the itinerary must use all tickets exactly once ....
leetcode Hard array string depth-first-search graph-theory sorting heap-(priority-queue) eulerian-circuit May 28, 2026