Sets-STL in C++ - Hacker Rank Solution
Sets-STL in C++ - Hacker Rank Solution
Problem
Sets are a part of the C++ STL. Sets are containers that store unique elements
following a specific order. Here are some of the frequently used member
functions of sets:
set<int>s; //Creates a set of integers.
Size:
int length=s.size(); //Gives the size of the set.
Insert:
s.insert(x); //Inserts an integer x into the set s.
Erasing an element:
s.erase(val); //Erases an integer val from the set s.
Finding an element:
set<int>::iterator itr=s.find(val); //Gives the iterator to the element val if it is found otherwise returns s.end() . Ex: set<int>::iterator itr=s.find(100); //If 100 is not present then it==s.end().
To know more about sets click Here. Coming to the problem, you will be given Q queries. Each query is of one of the following three types:
- x: Add an element x to the set.
- x: Delete an element x from the set. (If the number x is not present in the set, then do nothing).
- x: If the number x is present in the set, then print "Yes"(without quotes) else print "No"(without quotes).
Input Format :
The first line of the input contains Q where Q is the number of queries. The
next Q lines contain 1 query each. Each query consists of two integers x and y
where y is the type of the query and x is an integer.
Constraints :
- 1 <= Q <= 10^5
- 1 <= y <= 3
- 1 <= x <= 10^9
Output Format :
For queries of type 3 print "Yes"(without quotes) if the number x is present
in the set and if the number is not present, then print "No"(without
quotes).
Each query of type 3 should be printed in a new line.
Each query of type 3 should be printed in a new line.
Sample Input :
8 1 9 1 6 1 10 1 4 3 6 3 14 2 6 3 6
Sample Output :
Yes No No
Solution :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | //Sets-STL in C++ - Hacker Rank Solution #include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <set> #include <algorithm> using namespace std; int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ /* Sets-STL in C++ - Hacker Rank Solution START */ set <int> s; int N = 0, i; cin >> N; for (i = 0; i < N; i++) { int q = 0, x = 0; cin >> q; cin >> x; if (q == 1) { s.insert(x); } else if (q == 2) { s.erase(x); } else { set<int>::iterator itr=s.find(x); if (itr == s.end()) { cout<<"No"<<endl; } else { cout<<"Yes"<<endl; } } } /* Sets-STL in C++ - Hacker Rank Solution END */ return 0; } |
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CodeWorld19
Hey, I am Parthe Omkar
solution is correct