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You are given a collection of N non-empty strings, denoted by S₁, S₂,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The ith operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. St="", i.e. make the bth string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing St. Given these operations to join strings, print the last string that will remain at the end of this process.

You are given a collection of N non-empty strings, denoted by S₁, S₂,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The ith operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. St="", i.e. make the bth string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing St. Given these operations to join strings, print the last string that will remain at the end of this process.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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You are given a collection of N non-empty strings, denoted by S1,S2,…,Sn. Then you are given N-1 operations which you execute in the order they are given.

 

You are given a collection of N non-empty strings, denoted by S₁, S₂,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The įth operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+ Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. S = "", i.e. make the 6th string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing S. Given these operations to join strings, print the last string that will remain at the end of this process. Input The first line contains an integer N (1 ≤N≤ 105) denoting the number of strings given. Each of the next N lines contains a string denoting the S₁. All the characters in the string S, are lowercase alphabets from 'a' to 'z'. The total number of characters over all the strings is at most 106, i.e Σ₁|S₁| ≤ 106, where |S₁| denotes the length of the ith string. After these N strings, each of the next N-1 lines contain two integers a and b, such that a b and 1 ≤ a,b ≤ N denoting the ith operation. Output Print the last string which remains at the end of the N-1 operations.
Transcribed Image Text:You are given a collection of N non-empty strings, denoted by S₁, S₂,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The įth operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+ Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. S = "", i.e. make the 6th string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing S. Given these operations to join strings, print the last string that will remain at the end of this process. Input The first line contains an integer N (1 ≤N≤ 105) denoting the number of strings given. Each of the next N lines contains a string denoting the S₁. All the characters in the string S, are lowercase alphabets from 'a' to 'z'. The total number of characters over all the strings is at most 106, i.e Σ₁|S₁| ≤ 106, where |S₁| denotes the length of the ith string. After these N strings, each of the next N-1 lines contain two integers a and b, such that a b and 1 ≤ a,b ≤ N denoting the ith operation. Output Print the last string which remains at the end of the N-1 operations.
Warning The I/O files are large. Please use fast I/O methods. Sample Input 1 4 is cute cat kattis is 32 4 1 34 Sample Input 2 3 howis this practicalexam 1 2 1 3 Sample Output 1 kattiscatiscute Sample Output 2 howisthispracticalexam →
Transcribed Image Text:Warning The I/O files are large. Please use fast I/O methods. Sample Input 1 4 is cute cat kattis is 32 4 1 34 Sample Input 2 3 howis this practicalexam 1 2 1 3 Sample Output 1 kattiscatiscute Sample Output 2 howisthispracticalexam →
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