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Server Side Programming Articles
Page 1317 of 2109
K Inverse Pairs Array in C++
Suppose we have two integers n and k, we have to find how many different arrays consist of numbers from 1 to n such that there are exactly k inverse pairs. The inverse pair is for ith and jth element in the array, if i < j and a[i] > a[j] it is called an inverse pair. Here the answer may be very large, the answer should be modulo $10^{9}$ + 7.So if the input is like n = 3 and k = 1, then the output will be 2 as the arrays [1, 3, 2] and [2, 1, 3] ...
Read MoreInsert Interval in C++
Suppose we have a set of non-overlapping intervals; we have to insert a new interval into the intervals. We can merge if necessary. So if the input is like − [[1, 4], [6, 9]], and new interval is [2, 5], then the output will be [[1, 5], [6, 9]].To solve this, we will follow these steps −Insert new interval at the end of the previous interval listsort the interval list based on the initial time of the intervals, n := number of intervalscreate one array called ans, insert first interval into ansindex := 1while index < n, last := size ...
Read MoreRandom Pick with Blacklist in C++
Suppose we have a blacklist called B. This is holing unique integers from range [0, N), we have to define a function to return a uniform random integer from range [0, N) which is NOT in B. We will try to make this function more optimized by reducing random(). function call. Suppose the input array is likeTo solve this, we will follow these steps −Define one mapWe will initialize with N and array v.for initalize i := 0, when i < size of v, update (increase i by 1), do −if v[i] < N, then:, m[v[i]] := -1M := N ...
Read MoreText Justification in C++
Suppose we have an array of words and a width maxWidth, we have to format the text such that each line has exactly maxWidth number of characters and is fully justified. We should pack our words in a greedy approach; so that is, pack as many words as we can in each line. We will pad extra spaces ' ' when necessary so that each line has exactly maxWidth characters.Here extra spaces between words should be distributed as evenly as possible. If the number of spaces on a line do not divide evenly between words, empty slots on the left ...
Read MoreMinimum Window Substring in C++
Suppose we have a string S and T. We have to find the minimum window in S which will contain all the characters in T. So if the input is like “ABHDAXCVBAGTXATYCB” and T = “ABC”, then the result will be: “CVBA”.To solve this, we will follow these steps −Create one map mstore the frequency of x into mlength := size of s, left := 0, right := 0, ansLeft := 0 and ansRight := 0counter := size of x, flag := false, ans := empty stringwhile height < size of s −c := s[right]if c is present in m, ...
Read MoreFind K-th Smallest Pair Distance in C++
Suppose we have an integer array; we have to find the kth smallest distance among all the pairs. The distance of a pair (A, B) is actually the absolute difference between A and B. So if the input is like [1, 3, 8], then all possible pairs are [1, 3], [3, 8], [1, 8], then when k = 2, the second smallest distance is 5 (8 - 3).To solve this, we will follow these steps −n := size of nums, x := 0for initialize i := 0, when i < n, update (increase i by 1), do −x := maximum ...
Read MoreMaximal Rectangle in C++
Suppose we have a 2D binary matrix where 0s and 1 values are present. We have to find the largest rectangle containing only 1s and return its area.To solve this, we will follow these steps−Define a function called getAns, this will take array acreate stack st, i := 0, ans := 0while i < size of a, thenif stack is empty or a[i] >= top of stack, then insert i into st, increase i by 1otherwise −height := a[top of stack], delete from stackwidth := i when stack is empty, otherwise i – top of st – 1area := height ...
Read MoreReaching Points in C++
Suppose we have a starting points (sx, sy), and target point (tx, ty), we have to check whether a sequence of moves exists from the start point to the end point. Here move consists of taking a point (x, y) and transforming it to either (x, x+y) or (x+y, y).So if the inputs are (1, 1) and (4, 5), then the answer will be true, this is because move (1, 1) to (2, 1), then (3, 1), then (4, 1), then (4, 5).To solve this, we will follow these steps −while tx > sx and ty > sy, do −if ...
Read MoreInterleaving String in C++
Suppose we have three strings s1, s2 and s3. Then check whether s3 is formed by interleaving s1 and s2 or not. So if the strings are “aabcc”, s2 = “dbbca”, and s3 is “aadbbcbcac”, then the result will be true.To solve this, we will follow these steps −Define one method called solve(), this will take s1, s2, s3 and one 3d array dp, then i, j, kif i = 0 and j = 0 and k = 0, then return trueif dp[i, j, k] is not -1, then return dp[i, j, k]ans := falseif j > 0 and k ...
Read MorePreimage Size of Factorial Zeroes Function in C++
Suppose we have a function f(x), this will return the number of zeroes at the end of factorial of x. So for f(3) = 0 because 3! = 6 has no zeroes at the end, while f(11) = 2 because 11! = 39916800 has 2 zeroes at the end. Now when we have K, we have to find how many non-negative integers x have the property that f(x) = K.So if the input is like K = 2, then the answer will be 5.To solve this, we will follow these steps −Define a function ok(), this will take x,ret := 0for initialize i := 5, when i
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