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Archive for December 2019

Unique Paths II

Problem Statement A robot is located at the top-left corner of a m x n grid (marked ‘Start’ in the diagram below). The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘Finish’ . . . Read more

Minimum Swaps To Make Sequences Increasing

Problem Statement We have two integer sequences A and B of the same non-zero length. We are allowed to swap elements A[i] and B[i]. Note that both elements are in the same index position in their respective sequences. At the end of some number of swaps, A and B are . . . Read more

Pascal Triangle

Problem StatementThe figure below illustrates the first five rows of a graphic that is known as Pascal’s triangle. Each entry in each row before the last one is adjacent to one or two numbers in the lower row. It is a fact that each entry holds the sum of the . . . Read more

Target Sum

Problem Statement You are given a list of non-negative integers, a1, a2, …, an, and a target, S. Now you have 2 symbols + and -. For each integer, you should choose one from + and – as its new symbol. Find out how many ways to assign symbols to . . . Read more

Number of Dice Rolls With Target Sum

Problem Statement You have d dice, and each die has f faces numbered 1, 2, …, f. Return the number of possible ways (out of fd total ways) modulo 10^9 + 7 to roll the dice so the sum of the face up numbers equals target. Example 1 Input: d . . . Read more

Coin Change

Problem Statement You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you need to make up that amount. If that amount of money cannot be made up by any combination of the coins, return . . . Read more