Suppose we have an edge list of a directed graph, there are n nodes and node names are 0 to n- 1. We also have two integer values a and b. We have to check whether there is any node c such that we can go from c to a ... Read More

Suppose we have a 2D matrix where each cell matrix[r, c] represents the number of coins present in that cell. When we pick up coins from matrix[r, c], all the coins on row (r - 1) and (r + 1) will disappear, as well as the coins at the two ... Read More

Suppose we have two lists, they are cores and tasks. The cores[i] indicates number of cores available in the ith server. And tasks[i] indicates the number of cores needed to execute that task. Each task must be run in only one server. And a server may have multiple tasks to ... Read More

Suppose we have a circular list called nums. So the first and the last elements are neighbors. So starting from any index say i, we can move nums[i] number of steps forward if nums[i] is a positive value, otherwise backwards if it's a negative value. We have to check whether ... Read More

Suppose we have a string s which consists of only three characters "X", "(", and ")". The string has balanced brackets and in between some "X"s are there along with possibly nested brackets may also there recursively. We have to find the number of "X"s at each depth of brackets ... Read More

Suppose we have a lowercase string s and another list of integers called shifts whose length is same as the length of s. Here each element in shifts[i] indicates it to shift the first i + 1 letters of s by shifts[i] positions. If shifting crosses 'z' it will be ... Read More

Suppose we have a list of numbers called bricks and two other values width and height. Each element in bricks[i] represents a brick whose length is bricks[i] units and width is 1 unit. We have to find the number of ways to lay the bricks such that we get full ... Read More

Suppose we have two list of numbers nums1 and nums2. And also have two numbers lower and upper. We have to find the number of pairs (i, j) such that lower ≤ nums1[i]^2 + nums2[j]^2 ≤ upper.So, if the input is like nums1 = [5, 3, 2] nums2 = [8, ... Read More

Suppose we have a string s, that represents the moves of a robot. Robot is currently at (0, 0) position and it is facing north. The move string s may have these characters"F" to move forward direction, one unit"L" to rotate 90 degrees’ left"R" to rotate 90 degrees’ rightSo if ... Read More

Suppose we have two values start and end, we have to find the bitwise AND of all numbers in the range [start, end] (both inclusive).So, if the input is like start = 8 end = 12, then the output will be 8 is 1000 in binary and 12 is 1100 ... Read More