Suppose we have a n x n grid of characters with dots (.) and asterisks (*). All cells are marked as dot except two cells. We have to mark two more cells so that they are the corners of a rectangle with sides parallel to the coordinate axes. If there ... Read More

Suppose we have a numeric string S with n digits. We perform the following operation with the string S, no more than once. We select two numbers i and j (1 ≤ i ≤ j ≤ n) and removes characters from S string from positions i to j. We have ... Read More

Suppose we have three numbers n, m and k. There is a n x m grid. we are currently at cell (0, 0) top left corner and we want to reach cell (n - 1, m - 1). We can move to the neighboring cells to the right or down. ... Read More

Suppose we have four numbers a, b, c and d. In a box there are some numeri digits. There are 'a' number of digits 2, 'b' number of digits 3, 'c' number of digits 5 and 'd' number of digits 6. We want to compose numbers 32 and 256 from ... Read More

Suppose we have an array A with n elements. There are n participants, the i-th participant chose the number A[i]. The winner of the bidding game is such a participant that the number he chose is unique and is minimal. We have to find the index of the participant who ... Read More

Suppose we have an array A with n elements. Consider there is a bookshelf and this =can fit n books. The i-th position of bookshelf is A[i], is 1 if there is a book on this position and 0 otherwise. There will be at least one book in the bookshelf. ... Read More

Suppose we have a string S with n letters. Amal is trying to send a file in the social network, but there is an unexpected problem. If the name of the file contains three or more "x" consecutively, the system considers that the file content does not correspond to the ... Read More

Suppose we have an array A with n elements. Amal has n friends, the i-th of his friends has A[i] number of candies. Amal's friends do not like when they have different numbers of candies. So Amal performs the following set of actions exactly once −Amal chooses k (0 ≤ ... Read More

Suppose we have three numbers a, b and c. There are k numbers of students (k is even) standing on a circle, they are numbered from 1 to k in clockwise order. We do not know the value of k. Each person is watching through the center of the circle ... Read More

Suppose we have an array A with n elements. We can make another array consisting of n copies of the old array, added elements back-to-back. We have to find the the length of the new array's longest increasing subsequence? We know that a sequence p is a subsequence of an ... Read More