## Vaccine Distribution  Codechef December Long challenge solution 2020-

This Problem vaccine distribution is taken from December long challenge 2020. lets read problem statement.

### Problem statement-

Finally, a COVID vaccine is out on the market and the Chefland government has asked you to form a plan to distribute it to the public as soon as possible. There are a total of $N$ people with ages ${a}_{1},{a}_{2},\dots ,{a}_{N}$.

There is only one hospital where vaccination is done and it is only possible to vaccinate up to $D$ people per day. Anyone whose age is $\ge 80$ or $\le 9$ is considered to be at risk. On each day, you may not vaccinate both a person who is at risk and a person who is not at risk. Find the smallest number of days needed to vaccinate everyone.

### 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 line of each test case contains two space-separated integers $N$ and $D$.
• The second line contains $N$ space-separated integers ${a}_{1},{a}_{2},\dots ,{a}_{N}$.

### Output

For each test case, print a single line containing one integer ― the smallest required number of days.

### Constraints

• $1\le T\le 10$
• $1\le N\le {10}^{4}$
• $1\le D\le {10}^{5}$
• $1\le {a}_{i}\le 100$ for each valid $i$

Subtask #1 (100 points): original constraints

### Example Input

2
10 1
10 20 30 40 50 60 90 80 100 1
5 2
9 80 27 72 79

10
3

### Explanation

Example case 1: We do not need to worry about how the people are grouped, since only one person can be vaccinated in a single day. We require as many days as there are people.

Example case 2: There are two people at risk and three people who are not at risk. One optimal strategy is to vaccinate the two people at risk on day $1$ and the remaining three on the next $2$ days.

#### Solution-

Hint- This Problem can be solved using the brute force approach. make count of risky and non riskey person .

The problem can be solved by using simple if else statement follow my code i don't think there is a need for explanation.
For reference my code is mention below.
Join Telegram Channel for solution.

### codeforces rating system | Codeforces rating Newbie to Legendary Grandmaster

Codeforces rating system | Codeforces rating Newbie to Legendary Grandmaster- Codeforces is one of the most popular platforms for competitive programmers and  codeforces rating matters a lot  .  Competitive Programming  teaches you to find the easiest solution in the quickest possible way. CP enhances your problem-solving and debugging skills giving you real-time fun. It's brain-sport. As you start solving harder and harder problems in live-contests your analytical and rational thinking intensifies. To have a good codeforces profile makes a good impression on the interviewer. If you have a good  codeforces profile so it is very easy to get a referral for product base company like amazon, google , facebook etc.So in this blog I have explained everything about codeforces rating system. What are different titles on codeforces- based on rating codeforces divide rating into 10 part. Newbie Pupil Specialist Expert Candidate Codemaster Master International Master Grandmaster Internat

### Apple Division CSES Problem Set Solution | CSES Problem Set Solution Apple division with code

Apple Division CSES Problem Set Solution | CSES Problem Set Solution Apple division with code - Apple Division CSES Problem Solution Easy Explanation. Apple division is problem is taken form cses introductory problem set.Let's Read Problem statement first. Problem Statement- Time limit:  1.00 s   Memory limit:  512 MB There are  n n  apples with known weights. Your task is to divide the apples into two groups so that the difference between the weights of the groups is minimal. Input The first input line has an integer  n n : the number of apples. The next line has  n n  integers  p 1 , p 2 , … , p n p 1 , p 2 , … , p n : the weight of each apple. Output Print one integer: the minimum difference between the weights of the groups. Constraints 1 ≤ n ≤ 20 1 ≤ n ≤ 20 1 ≤ p i ≤ 10 9 1 ≤ p i ≤ 10 9 Example Input: 5 3 2 7 4 1 Output: 1 Explanation: Group 1 has weights 2, 3 and 4 (total weight 9), and group 2 has weights 1 and 7 (total weight 8). Join Telegram channel for code discussi

### Concert Tickets Cses Problem set solution | Concert Tickets Cses Problem set solution Using multiset

Concert Tickets Cses Problem set solution- Porblem statement- Time limit:  1.00 s   Memory limit:  512 MB There are  n n  concert tickets available, each with a certain price. Then,  m m  customers arrive, one after another. Each customer announces the maximum price he or she is willing to pay for a ticket, and after this, they will get a ticket with the nearest possible price such that it does not exceed the maximum price. Input The first input line contains integers  n n  and  m m : the number of tickets and the number of customers. The next line contains  n n  integers  h 1 , h 2 , … , h n h 1 , h 2 , … , h n : the price of each ticket. The last line contains  m m  integers  t 1 , t 2 , … , t m t 1 , t 2 , … , t m : the maximum price for each customer. Output Print, for each customer, the price that they will pay for their ticket. After this, the ticket cannot be purchased again. If a customer cannot get any ticket, print  − 1 − 1 . Constraints 1 ≤ n , m ≤ 2 ⋅ 10 5 1 ≤ n , m ≤ 2 ⋅