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Suppose we have a pattern p and a string str, we have to check whether str follows the same pattern or not. Here follow means there is a bijection between a letter in pattern and a non-empty word in str.So, if the input is like pattern = "cbbc", str = "word pattern pattern word", then the output will be True.To solve this, we will follow these steps −strcin := strDefine an array wordsfor each word in strcininsert word at the end of wordsDefine one map p2ii := 0pat := empty stringfor c in pattern −if c is not member of ... Read More
Suppose we have a lowercase string s, we can partition s into as many pieces as possible such that each letter appears in at most one piece and find the sizes of the partitions as a list.So, if the input is like s = "momoplaykae", then the output will be [4, 1, 1, 4, 1], as the string is split into ["momo", "p", "l", "ayka", "e"].To solve this, we will follow these steps −count := a map that contains characters in s and their occurrencesout := a new list, stk := an empty stacklength := 0for each char in s, ... Read More
Suppose we have a 2d binary matrix and another value k. Now starting from the top-left cell, we have to go to the bottom right cell. In one step, we can only go down, or right. Now the score of a path is the sum of the values on the cells on the path. We have to find the number of paths from the start cell to end cell with score k. If there are huge possible ways then return result mod 10^9+7.So, if the input is like001101010K = 2, then the output will be 4, as the paths with ... Read More
Suppose we want to paint a row of N fences with K different colors. We want to minimize the cost while ensuring that no two neighboring fences are of the same color. So if we have an N x K matrix where the nth row and kth column represents the cost to paint the nth fence with kth color, we have to find the minimum cost which achieves this goal.So, if the input is like645327345544then the output will be 14, as we can select the following color indices (starting from the first fence) − 5 → 2 → 3 → ... Read More
Suppose we have two lists sales and buyers. Each element in sales contains two values in the form [day, price] this indicates the package is available for sale only on that day for that given price. And each element in buyers in the form [payday, amount] indicates that the buyer has that amount of money to spend on payday and afterward. If each buyer can buy at most one package, and each package can be sold to only one person, find the maximum number of packages that can be bought.So, if the input is like sales = [[0, 5], [0, ... Read More
Suppose we have a list nums of N positive numbers. Now we can select any single value from the list, and move (not swap) it to any position. We can also not move any to position at all. So we have to find what is the maximum possible final power of the list? As we know the power of a list is the sum of (index + 1) * value_at_index over all indices i.$$\displaystyle\sum\limits_{i=0}^{n-1} (i+1)\times list[i]$$So, if the input is like nums = [6, 2, 3], then the output will be 26, as we can move the 6 to the ... Read More
Suppose we have a list of numbers called nums and another value k, we have to find the size of the longest increasing subsequence with at least k odd elements.So, if the input is like nums = [12, 14, 16, 5, 7, 8] k = 2, then the output will be 3, as the longest increasing subsequence with at least 2 odd values is [5, 7, 8].To solve this, we will follow these steps −best := 0Define a function dp() . This will take i, j, odd, takenif odd >= k, thenbest := maximum of best and takenif j is ... Read More
Suppose we have a number n. Now consider an operation where we can either 1. Decrement n by one 2. If n is even number, then decrement it by n / 2 3. If n is divisible by 3, then decrement by 2 * (n / 3) Finally find the minimum number of operations required to decrement n to zero.So, if the input is like n = 16, then the output will be 5, as n = 16 even then decreases it by n/2 4 times, it will be 1. Then reduce it by 1 to get 0. So total ... Read More
Suppose we have a number n, we have to find the next bigger permutation of its digits. When n is already in its largest permutation, then rotate it down to the smallest permutation.So, if the input is like n = 319, then the output will be 391.To solve this, we will follow these steps −Define a function makeArray(), this will take x, Define an array retwhile x is non-zero, do −insert x mod 10 at the end of retx := x / 10reverse the array retreturn retDefine a function combine(), this will take an array v, ret := 0for each ... Read More
Suppose we have a binary matrix where 0 is representing empty cell and 1 is representing a chess queen at that cell. We have to check whether we can fill this board and get a valid nqueen solution or not. As we know the n queens puzzle asks to place n queens on an n × n chessboard so that no two chess queens can attack each other.So, if the input is like1000000000000010000000010then the output will be True, as one solution is like −1000000100000010100000010To solve this, we will follow these steps −Define a function isSafe() . This will take board, ... Read More