06 2019 档案
摘要：题目如下： Given a matrix, and a target, return the number of non-empty submatrices that sum to target. A submatrix x1, y1, x2, y2 is the set of all cells
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摘要：题目如下： (This problem is an interactive problem.) You may recall that an array A is a mountain array if and only if: A.length >= 3 There exists some i w
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摘要：题目如下： You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only drives east (ie. it cannot turn aro
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摘要：题目如下： We sampled integers between 0 and 255, and stored the results in an array count: count[k] is the number of integers we sampled equal to k. Retur
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摘要：题目如下： In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-right has length k if and only if i
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摘要：题目如下： Given an integer array A, you partition the array into (contiguous) subarrays of length at most K. After partitioning, each subarray has their v
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摘要：题目如下： We have a set of items: the i-th item has value values[i] and label labels[i]. Then, we choose a subset S of these items, such that: |S| <= num_
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摘要：题目如下： Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right. Note that elements
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摘要：题目如下： Given the root of a binary search tree with distinct values, modify it so that every node has a new value equal to the sum of the values of the
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摘要：题目如下： Given the root of a binary tree, consider all root to leaf paths: paths from the root to any leaf. (A leaf is a node with no children.) A node i
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摘要：题目如下： Given a matrix consisting of 0s and 1s, we may choose any number of columns in the matrix and flip every cell in that column. Flipping a cell ch
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摘要：题目如下： You have a set of tiles, where each tile has one letter tiles[i]printed on it. Return the number of possible non-empty sequences of letters you
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摘要：题目如下： Return the lexicographically smallest subsequence of text that contains all the distinct characters of text exactly once. Example 1: Example 2:
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摘要：题目如下： Given words first and second, consider occurrences in some text of the form "first second third", where second comes immediately after first, an
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摘要：题目如下： Given two numbers arr1 and arr2 in base -2, return the result of adding them together. Each number is given in array format: as an array of 0s a
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摘要：题目如下： For strings S and T, we say "T divides S" if and only if S = T + ... + T (T concatenated with itself 1 or more times) Return the largest string
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