题目

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.

题目

Say you have an array for which the ith element is the price of a given stock on day i.

If you were only permitted to complete at most one transaction (i.e., buy one and sell one share of the stock), design an algorithm to find the maximum profit.

Note that you cannot sell a stock before you buy one.

题目

You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the following definition:

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struct Node {
int val;
Node *left;
Node *right;
Node \*next;
}

题目

Given a non-negative integer numRows, generate the first numRows of Pascal's triangle.

题目

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 X such that X divides str1 and X divides str2.