Dynamic Array in C
Problem Statement :
Snow Howler is the librarian at the central library of the city of HuskyLand. He must handle requests which come in the following forms:
1 x y : Insert a book with y pages at the end of the xth shelf.
2 x y : Print the number of pages in the yth
book on the xth shelf.
3 x : Print the number of books on the xth shelf.
Snow Howler has got an assistant, Oshie, provided by the Department of Education. Although inexperienced, Oshie can handle all of the queries of types 2 and 3.
Help Snow Howler deal with all the queries of type 1.
Oshie has used two arrays:
int* total_number_of_books;
/*
* This stores the total number of books on each shelf.
*/
int** total_number_of_pages;
/*
* This stores the total number of pages in each book of each shelf.
* The rows represent the shelves and the columns represent the books.
*/
Input Format
The first line contains an integer total_number_of_shelves , the number of shelves in the library.
The second line contains an integer total_number_of_queries , the number of requests.
Each of the following total_number_of_queries lines contains a request in one of the three specified formats.
Constraints
1 <= total_number_of_shelves <= 10^5
1 <= total_number_of_queries <= 10^5
For each query of the second type, it is guaranteed that a book is present on the xth shelf at yth index.
0 <= x < total_number_of_shelves
Both the shelves and the books are numbered starting from 0.
Maximum number of books per shelf <= 1100.
Output Format
Write the logic for the requests of type 1. The logic for requests of types 2 and 3 are provided.
Solution :
Solution in C :
int main()
{
int total_number_of_shelves;
scanf("%d", &total_number_of_shelves);
int total_number_of_queries;
scanf("%d", &total_number_of_queries);
total_number_of_books=(int*)malloc(sizeof(int)*total_number_of_shelves);
total_number_of_pages=(int**)malloc(sizeof(int*)*total_number_of_shelves);
for(int i=0; i<total_number_of_shelves; i++){
total_number_of_books[i]=0;
total_number_of_pages[i]=(int*)malloc(sizeof(int));
}
while (total_number_of_queries--) {
int type_of_query;
scanf("%d", &type_of_query);
if (type_of_query == 1) {
int x, y;
scanf("%d %d", &x, &y);
*(total_number_of_books+x)+=1;
*(total_number_of_pages+x)=realloc(*(total_number_of_pages+x), *(total_number_of_books+x)*sizeof(int));
*(*(total_number_of_pages+x)+*(total_number_of_books+x)-1)=y;
View More Similar Problems
Fibonacci Numbers Tree
Shashank loves trees and math. He has a rooted tree, T , consisting of N nodes uniquely labeled with integers in the inclusive range [1 , N ]. The node labeled as 1 is the root node of tree , and each node in is associated with some positive integer value (all values are initially ). Let's define Fk as the Kth Fibonacci number. Shashank wants to perform 22 types of operations over his tree, T
View Solution →Pair Sums
Given an array, we define its value to be the value obtained by following these instructions: Write down all pairs of numbers from this array. Compute the product of each pair. Find the sum of all the products. For example, for a given array, for a given array [7,2 ,-1 ,2 ] Note that ( 7 , 2 ) is listed twice, one for each occurrence of 2. Given an array of integers, find the largest v
View Solution →Lazy White Falcon
White Falcon just solved the data structure problem below using heavy-light decomposition. Can you help her find a new solution that doesn't require implementing any fancy techniques? There are 2 types of query operations that can be performed on a tree: 1 u x: Assign x as the value of node u. 2 u v: Print the sum of the node values in the unique path from node u to node v. Given a tree wi
View Solution →Ticket to Ride
Simon received the board game Ticket to Ride as a birthday present. After playing it with his friends, he decides to come up with a strategy for the game. There are n cities on the map and n - 1 road plans. Each road plan consists of the following: Two cities which can be directly connected by a road. The length of the proposed road. The entire road plan is designed in such a way that if o
View Solution →Heavy Light White Falcon
Our lazy white falcon finally decided to learn heavy-light decomposition. Her teacher gave an assignment for her to practice this new technique. Please help her by solving this problem. You are given a tree with N nodes and each node's value is initially 0. The problem asks you to operate the following two types of queries: "1 u x" assign x to the value of the node . "2 u v" print the maxim
View Solution →Number Game on a Tree
Andy and Lily love playing games with numbers and trees. Today they have a tree consisting of n nodes and n -1 edges. Each edge i has an integer weight, wi. Before the game starts, Andy chooses an unordered pair of distinct nodes, ( u , v ), and uses all the edge weights present on the unique path from node u to node v to construct a list of numbers. For example, in the diagram below, Andy
View Solution →