題庫

共 810 道題目含解題說明

#	題目	難度	Rating	Topics
103	Binary Tree Zigzag Level Order Traversal	Medium	1576	treebreadth-first-searchbinary-tree
104	Maximum Depth of Binary Tree	Easy	1116	treedepth-first-searchbreadth-first-search+1
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	1643	arrayhash-tabledivide-and-conquer+2
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	1660	arrayhash-tabledivide-and-conquer+2
107	Binary Tree Level Order Traversal II	Medium	1436	treebreadth-first-searchbinary-tree
108	Convert Sorted Array to Binary Search Tree	Easy	1281	arraydivide-and-conquertree+2
109	Convert Sorted List to Binary Search Tree	Medium	—	linked-listdivide-and-conquertree+2
110	Balanced Binary Tree	Easy	1194	treedepth-first-searchbinary-tree
111	Minimum Depth of Binary Tree	Easy	1248	treedepth-first-searchbreadth-first-search+1
112	Path Sum	Easy	1181	treedepth-first-searchbreadth-first-search+1
114	Flatten Binary Tree to Linked List	Medium	1519	linked-liststacktree+2
115	Distinct Subsequences	Hard	1849	stringdynamic-programming
116	Populating Next Right Pointers in Each Node	Medium	—	linked-listtreedepth-first-search+2
117	Populating Next Right Pointers in Each Node II	Medium	1628	linked-listtreedepth-first-search+2
118	Pascal's Triangle	Easy	1168	arraydynamic-programming
119	Pascal's Triangle II	Easy	1178	arraydynamic-programming
120	Triangle	Medium	1533	arraydynamic-programming
121	Best Time to Buy and Sell Stock	Easy	1487	arraydynamic-programming
122	Best Time to Buy and Sell Stock II	Medium	1486	arraydynamic-programminggreedy
123	Best Time to Buy and Sell Stock III	Hard	1977	arraydynamic-programming
124	Binary Tree Maximum Path Sum	Hard	1807	dynamic-programmingtreedepth-first-search+1
125	Valid Palindrome	Easy	1138	two-pointersstring
127	Word Ladder	Hard	2061	hash-tablestringbreadth-first-search
128	Longest Consecutive Sequence	Medium	1680	arrayhash-tableunion-find
129	Sum Root to Leaf Numbers	Medium	1399	treedepth-first-searchbinary-tree
130	Surrounded Regions	Medium	1706	arraydepth-first-searchbreadth-first-search+2
131	Palindrome Partitioning	Medium	1615	stringdynamic-programmingbacktracking
133	Clone Graph	Medium	1521	hash-tabledepth-first-searchbreadth-first-search+1
134	Gas Station	Medium	1767	arraygreedy
135	Candy	Hard	1750	arraygreedy
136	Single Number	Easy	1150	arraybit-manipulation
137	Single Number II	Medium	1710	arraybit-manipulation
138	Copy List with Random Pointer	Medium	1618	hash-tablelinked-list
139	Word Break	Medium	1673	arrayhash-tablestring+3
140	Word Break II	Hard	2081	hash-tablestringdynamic-programming+3
141	Linked List Cycle	Easy	1302	hash-tablelinked-listtwo-pointers
142	Linked List Cycle II	Medium	1484	linked-listtwo-pointershash-table
143	Reorder List	Medium	1532	linked-listtwo-pointersstack+1
144	Binary Tree Preorder Traversal	Easy	1258	stacktreedepth-first-search+1
145	Binary Tree Postorder Traversal	Easy	1214	stacktreedepth-first-search+1
146	LRU Cache	Medium	1793	hash-tablelinked-listdesign+1
147	Insertion Sort List	Medium	1620	linked-listsorting
148	Sort List	Medium	1636	linked-listtwo-pointersdivide-and-conquer+2
149	Max Points on a Line	Hard	1978	arrayhash-tablemath+1
150	Evaluate Reverse Polish Notation	Medium	1492	arraymathstack
151	Reverse Words in a String	Medium	1384	two-pointersstring
152	Maximum Product Subarray	Medium	1555	arraydynamic-programming
153	Find Minimum in Rotated Sorted Array	Medium	1485	arraybinary-search
155	Min Stack	Medium	1419	stackdesign
160	Intersection of Two Linked Lists	Easy	1495	linked-listhash-tabletwo-pointers

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題庫

共 810 道題目含解題說明

All Easy Medium Hard

#	題目	難度	Rating	Topics
103	Binary Tree Zigzag Level Order Traversal	Medium	1576	treebreadth-first-searchbinary-tree
104	Maximum Depth of Binary Tree	Easy	1116	treedepth-first-searchbreadth-first-search+1
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	1643	arrayhash-tabledivide-and-conquer+2
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	1660	arrayhash-tabledivide-and-conquer+2
107	Binary Tree Level Order Traversal II	Medium	1436	treebreadth-first-searchbinary-tree
108	Convert Sorted Array to Binary Search Tree	Easy	1281	arraydivide-and-conquertree+2
109	Convert Sorted List to Binary Search Tree	Medium	—	linked-listdivide-and-conquertree+2
110	Balanced Binary Tree	Easy	1194	treedepth-first-searchbinary-tree
111	Minimum Depth of Binary Tree	Easy	1248	treedepth-first-searchbreadth-first-search+1
112	Path Sum	Easy	1181	treedepth-first-searchbreadth-first-search+1
114	Flatten Binary Tree to Linked List	Medium	1519	linked-liststacktree+2
115	Distinct Subsequences	Hard	1849	stringdynamic-programming
116	Populating Next Right Pointers in Each Node	Medium	—	linked-listtreedepth-first-search+2
117	Populating Next Right Pointers in Each Node II	Medium	1628	linked-listtreedepth-first-search+2
118	Pascal's Triangle	Easy	1168	arraydynamic-programming
119	Pascal's Triangle II	Easy	1178	arraydynamic-programming
120	Triangle	Medium	1533	arraydynamic-programming
121	Best Time to Buy and Sell Stock	Easy	1487	arraydynamic-programming
122	Best Time to Buy and Sell Stock II	Medium	1486	arraydynamic-programminggreedy
123	Best Time to Buy and Sell Stock III	Hard	1977	arraydynamic-programming
124	Binary Tree Maximum Path Sum	Hard	1807	dynamic-programmingtreedepth-first-search+1
125	Valid Palindrome	Easy	1138	two-pointersstring
127	Word Ladder	Hard	2061	hash-tablestringbreadth-first-search
128	Longest Consecutive Sequence	Medium	1680	arrayhash-tableunion-find
129	Sum Root to Leaf Numbers	Medium	1399	treedepth-first-searchbinary-tree
130	Surrounded Regions	Medium	1706	arraydepth-first-searchbreadth-first-search+2
131	Palindrome Partitioning	Medium	1615	stringdynamic-programmingbacktracking
133	Clone Graph	Medium	1521	hash-tabledepth-first-searchbreadth-first-search+1
134	Gas Station	Medium	1767	arraygreedy
135	Candy	Hard	1750	arraygreedy
136	Single Number	Easy	1150	arraybit-manipulation
137	Single Number II	Medium	1710	arraybit-manipulation
138	Copy List with Random Pointer	Medium	1618	hash-tablelinked-list
139	Word Break	Medium	1673	arrayhash-tablestring+3
140	Word Break II	Hard	2081	hash-tablestringdynamic-programming+3
141	Linked List Cycle	Easy	1302	hash-tablelinked-listtwo-pointers
142	Linked List Cycle II	Medium	1484	linked-listtwo-pointershash-table
143	Reorder List	Medium	1532	linked-listtwo-pointersstack+1
144	Binary Tree Preorder Traversal	Easy	1258	stacktreedepth-first-search+1
145	Binary Tree Postorder Traversal	Easy	1214	stacktreedepth-first-search+1
146	LRU Cache	Medium	1793	hash-tablelinked-listdesign+1
147	Insertion Sort List	Medium	1620	linked-listsorting
148	Sort List	Medium	1636	linked-listtwo-pointersdivide-and-conquer+2
149	Max Points on a Line	Hard	1978	arrayhash-tablemath+1
150	Evaluate Reverse Polish Notation	Medium	1492	arraymathstack
151	Reverse Words in a String	Medium	1384	two-pointersstring
152	Maximum Product Subarray	Medium	1555	arraydynamic-programming
153	Find Minimum in Rotated Sorted Array	Medium	1485	arraybinary-search
155	Min Stack	Medium	1419	stackdesign
160	Intersection of Two Linked Lists	Easy	1495	linked-listhash-tabletwo-pointers

第 3 頁，共 17 頁

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