來自這個兄弟：http://blog.csdn.net/ddd_1206/article/category/6857937

利用堆棧：

http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/

http://oj.leetcode.com/problems/longest-valid-parentheses/

?（也可以用一維數組，貪心）

http://oj.leetcode.com/problems/valid-parentheses/

http://oj.leetcode.com/problems/largest-rectangle-in-histogram/

特別注意細節：http://oj.leetcode.com/problems/trapping-rain-water/

多種數據結構：

http://oj.leetcode.com/problems/lru-cache/

http://oj.leetcode.com/problems/substring-with-concatenation-of-all-words/

?(注意遍歷方法）

HASH：http://oj.leetcode.com/problems/longest-consecutive-sequence/

簡單編程：

http://oj.leetcode.com/problems/longest-common-prefix/

http://oj.leetcode.com/problems/string-to-integer-atoi/

?(分析，控制語句）

排序 & 查找：

二分查找：http://oj.leetcode.com/problems/search-a-2d-matrix/

二分查找進階：http://oj.leetcode.com/problems/search-for-a-range/

二分查找應用：http://oj.leetcode.com/problems/sqrtx/

二分查找應用：http://oj.leetcode.com/problems/search-insert-position/

二分查找變種：http://oj.leetcode.com/problems/search-in-rotated-sorted-array/

二分查找變種：http://oj.leetcode.com/problems/search-in-rotated-sorted-array-ii/

簡單數學：

http://oj.leetcode.com/problems/pascals-triangle/

http://oj.leetcode.com/problems/pascals-triangle-ii/

http://oj.leetcode.com/problems/powx-n/

http://oj.leetcode.com/problems/reverse-integer/

http://oj.leetcode.com/problems/plus-one/

http://oj.leetcode.com/problems/unique-paths/

http://oj.leetcode.com/problems/palindrome-number/

http://oj.leetcode.com/problems/permutation-sequence/

http://oj.leetcode.com/problems/merge-intervals/

http://oj.leetcode.com/problems/valid-number/

http://oj.leetcode.com/problems/climbing-stairs/

http://oj.leetcode.com/problems/roman-to-integer/

http://oj.leetcode.com/problems/integer-to-roman/

http://oj.leetcode.com/problems/divide-two-integers/

區間：http://oj.leetcode.com/problems/insert-interval/

大數的數學運算：

http://oj.leetcode.com/problems/add-binary/

http://oj.leetcode.com/problems/add-two-numbers/

數組：

http://oj.leetcode.com/problems/remove-element/

http://oj.leetcode.com/problems/merge-sorted-array/

http://oj.leetcode.com/problems/first-missing-positive/

http://oj.leetcode.com/problems/spiral-matrix/

http://oj.leetcode.com/problems/spiral-matrix-ii/

http://oj.leetcode.com/problems/rotate-image/

遍歷技巧：http://oj.leetcode.com/problems/container-with-most-water/

http://oj.leetcode.com/problems/two-sum/

http://oj.leetcode.com/problems/3sum/

http://oj.leetcode.com/problems/3sum-closest/

http://oj.leetcode.com/problems/4sum/

http://oj.leetcode.com/problems/set-matrix-zeroes/

用好標記數組：http://oj.leetcode.com/problems/valid-sudoku/

http://oj.leetcode.com/problems/next-permutation/

http://oj.leetcode.com/problems/word-search/

http://oj.leetcode.com/problems/remove-duplicates-from-sorted-array/

http://oj.leetcode.com/problems/remove-duplicates-from-sorted-array-ii/

http://oj.leetcode.com/problems/sort-colors/

暴力方法/細節實現：

http://oj.leetcode.com/problems/max-points-on-a-line/

鏈表：

歸并排序：http://oj.leetcode.com/problems/sort-list/

插入排序：http://oj.leetcode.com/problems/insertion-sort-list/

反轉、插入：http://oj.leetcode.com/problems/reorder-list/

檢測是否有環：http://oj.leetcode.com/problems/linked-list-cycle/

確定鏈表環的起點：http://oj.leetcode.com/problems/linked-list-cycle-ii/

Deep Copy 帶有隨機指針的鏈表：http://oj.leetcode.com/problems/copy-list-with-random-pointer/

鏈表細節：http://oj.leetcode.com/problems/rotate-list/

http://oj.leetcode.com/problems/remove-duplicates-from-sorted-list/

刪除細節：http://oj.leetcode.com/problems/remove-duplicates-from-sorted-list-ii/

http://oj.leetcode.com/problems/partition-list/

http://oj.leetcode.com/problems/swap-nodes-in-pairs/

Merge 兩個鏈表：http://oj.leetcode.com/problems/merge-two-sorted-lists/

Merge 多鏈表：http://oj.leetcode.com/problems/merge-k-sorted-lists/

細節：http://oj.leetcode.com/problems/reverse-nodes-in-k-group/

http://oj.leetcode.com/problems/remove-nth-node-from-end-of-list/

http://oj.leetcode.com/problems/reverse-linked-list-ii/

二叉樹遍歷：遞歸 & 非遞歸

http://oj.leetcode.com/problems/same-tree/

前序：http://oj.leetcode.com/problems/binary-tree-preorder-traversal/

中序：http://oj.leetcode.com/problems/binary-tree-inorder-traversal/

后序：http://oj.leetcode.com/problems/binary-tree-postorder-traversal/

遍歷變種：http://oj.leetcode.com/problems/sum-root-to-leaf-numbers/

遍歷變種：http://oj.leetcode.com/problems/path-sum/

遍歷變種：http://oj.leetcode.com/problems/path-sum-ii/

遍歷變種：http://oj.leetcode.com/problems/maximum-depth-of-binary-tree/

遍歷變種：http://oj.leetcode.com/problems/minimum-depth-of-binary-tree/

重建二叉樹：http://oj.leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/

重建二叉樹：http://oj.leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/

層次遍歷變種：http://oj.leetcode.com/problems/binary-tree-zigzag-level-order-traversal/

遍歷變種：http://oj.leetcode.com/problems/symmetric-tree/

遍歷應用：http://oj.leetcode.com/problems/binary-tree-maximum-path-sum/

遍歷應用：http://oj.leetcode.com/problems/balanced-binary-tree/

遍歷應用：http://oj.leetcode.com/problems/recover-binary-search-tree/

遍歷應用：http://oj.leetcode.com/problems/flatten-binary-tree-to-linked-list/

level遍歷：http://oj.leetcode.com/problems/binary-tree-level-order-traversal/

level 遍歷：http://oj.leetcode.com/problems/binary-tree-level-order-traversal-ii/

level 遍歷變種：http://oj.leetcode.com/problems/populating-next-right-pointers-in-each-node/

level 遍歷變種：http://oj.leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/

問題分析/智商/細節：

http://oj.leetcode.com/problems/single-number/

http://oj.leetcode.com/problems/single-number-ii/

http://oj.leetcode.com/problems/candy/

?？

http://oj.leetcode.com/problems/gas-station/

動態規劃：

http://oj.leetcode.com/problems/triangle/

?（最短路徑）

http://oj.leetcode.com/problems/subsets/

?（另一種形式）

http://oj.leetcode.com/problems/subsets-ii/

http://oj.leetcode.com/problems/edit-distance/

?（經典）

http://oj.leetcode.com/problems/word-break/

http://oj.leetcode.com/problems/word-break-ii/

http://oj.leetcode.com/problems/unique-binary-search-trees/

?（動態規劃避免遞歸）

http://oj.leetcode.com/problems/unique-paths-ii/

http://oj.leetcode.com/problems/scramble-string/

http://oj.leetcode.com/problems/palindrome-partitioning/

http://oj.leetcode.com/problems/palindrome-partitioning-ii/

http://oj.leetcode.com/problems/interleaving-string/

http://oj.leetcode.com/problems/distinct-subsequences/

http://oj.leetcode.com/problems/decode-ways/

http://oj.leetcode.com/problems/gray-code/

http://oj.leetcode.com/problems/minimum-path-sum/

回溯：

http://oj.leetcode.com/problems/combinations/

http://oj.leetcode.com/problems/generate-parentheses/

http://oj.leetcode.com/problems/combination-sum/

http://oj.leetcode.com/problems/combination-sum-ii/

http://oj.leetcode.com/problems/sudoku-solver/

經典N皇后：http://oj.leetcode.com/problems/n-queens/

http://oj.leetcode.com/problems/n-queens-ii/

http://oj.leetcode.com/problems/letter-combinations-of-a-phone-number/

貪心：

http://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock/

http://oj.leetcode.com/problems/jump-game/

http://oj.leetcode.com/problems/jump-game-ii/

http://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/

http://oj.leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/

http://oj.leetcode.com/problems/maximum-subarray/

http://oj.leetcode.com/problems/minimum-window-substring/

http://oj.leetcode.com/problems/maximal-rectangle/

http://oj.leetcode.com/problems/longest-substring-without-repeating-characters/

分治 & 遞歸：

http://oj.leetcode.com/problems/unique-binary-search-trees-ii/

http://oj.leetcode.com/problems/restore-ip-addresses/

?（時間復雜度有限，遞歸滿足）

http://oj.leetcode.com/problems/permutations/

http://oj.leetcode.com/problems/permutations-ii/

http://oj.leetcode.com/problems/convert-sorted-array-to-binary-search-tree/

http://oj.leetcode.com/problems/convert-sorted-list-to-binary-search-tree/

http://oj.leetcode.com/problems/median-of-two-sorted-arrays/

http://oj.leetcode.com/problems/validate-binary-search-tree/

字符串：

http://oj.leetcode.com/problems/count-and-say/

http://oj.leetcode.com/problems/implement-strstr/

?（子串查找）

http://oj.leetcode.com/problems/anagrams/

http://oj.leetcode.com/problems/text-justification/

?(細節）

http://oj.leetcode.com/problems/simplify-path/

?（基礎控制語句 if-else-for）

http://oj.leetcode.com/problems/multiply-strings/

http://oj.leetcode.com/problems/regular-expression-matching/

http://oj.leetcode.com/problems/wildcard-matching/

http://oj.leetcode.com/problems/longest-palindromic-substring/

http://oj.leetcode.com/problems/zigzag-conversion/

http://oj.leetcode.com/problems/length-of-last-word/

http://oj.leetcode.com/problems/valid-palindrome/

圖：

深搜/廣搜：http://oj.leetcode.com/problems/clone-graph/

搜索 & 遍歷：

http://oj.leetcode.com/problems/word-ladder/

http://oj.leetcode.com/problems/word-ladder-ii/

廣搜：http://oj.leetcode.com/problems/surrounded-regions/

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