Practice Question

We are back on our track after facing a lot of obstacles and here I am providing you two more example questions based on strings and some basic concepts of mathematics.

LUCKY FOUR

Prerequisites :: Basic knowledge of Strings

Kostya likes the number 4 much. Of course! This number has such a lot of properties, like:

And there are a lot more cool stuff about this number!
Impressed by the power of this number, Kostya has begun to look for occurrences of four anywhere. He has a list of T integers, for each of them he wants to calculate the number of occurrences of the digit 4 in the decimal representation. He is too busy now, so please help him.

Input
The first line of input consists of a single integer T, denoting the number of integers in Kostya’s list.

Then, there are T lines, each of them contain a single integer from the list.

Output
Output T lines. Each of these lines should contain the number of occurences of the digit 4 in the respective integer from Kostya’s list.

Constraints
1 ≤ T ≤ 105
(Subtask 1): 0 ≤ Numbers from the list ≤ 9 – 33 points.
(Subtask 2): 0 ≤ Numbers from the list ≤ 109 – 67 points.

Example::
Input:
5
447474
228
6664
40
81

Output:
4
0
1
1
0

Submission link for LUCKY FOUR :: https://www.codechef.com/submit/LUCKFOUR

RECTANGLE

Prerequisites : Basic Mathematics

You are given four integers a, b, c and d. Determine if there’s a rectangle such that the lengths of its sides are a, b, c and d (in any order).

Input:
The first line of the input contains a single integer T denoting the number of test cases. The description of T test cases follows.
The first and only line of each test case contains four space-separated integers a, b, c and d.

Output:
For each test case, print a single line containing one string “YES” or “NO”.

Constraints
1 ≤ T ≤ 1,000
1 ≤ a, b, c, d ≤ 10,000

Subtask #1 (100 points): original constraints

Example::
Input:
3
1 1 2 2
3 2 2 3
1 2 2 2

Output:

YES
YES
NO

Submission link for RECTANGLE:: https://www.codechef.com/submit/RECTANGL

Try, try and try, again and again until you solve these two cute problems.

Doesn’t matter how much time it will take, 1 hour/ 10 hours or a day. But you should keep trying. Brainstorming and continuously working hard is the only Måńțřå for enhancing the coding skills.

Check the solutions only after you tried as much possible for you. 🤗

Solution for Lucky Four ::
using namespace std;
int main()
{
long int t,n;
string str;
cin>>t;
while(t–)
{
int count=0,i;
cin>>str;
for(i=0;i<str.length();i++)
{
if(str[i]==’4′)
count++;
}
cout<<count;
}
}

Solution for Rectangle ::
using namespace std;
int main()
{
int t,a,b,c,d;
cin>>t;
while(t–)
{
cin>>a>>b>>c>>d;
if((a==b && c==d) || (a==c && b==d )||(a==d && b==c))
{
cout<<“YES”;
}
else
cout<<“NO”;
}
return 0;

}

Back soon🙋🏻‍♀️🤗🤗