The exam starts at 9 a.m.

The test lasts for five hours, which ends at 2 p.m.!

At half past eight in the morning, there was already a crowd outside the examination room.

There are 100 teams and 300 people.

In addition to these, there are also leading teachers, on-site staff, and so on.

At this point, the candidates have entered the examination room one after another, looking for their place.

"Xiao Jun, didn't you bring anything?" Professor Han Jiongda couldn't help but ask when he saw Xiao Jun empty-handed.

"No!" Xiao Jun said lightly.

"Oh, why don't you bring some source code, reference books, dictionaries, etc.? These things can be brought into the examination room! Han Jiongda secretly said that it was a pity. This is because the team members are not allowed to bring any electronic devices except for them. However, it is allowed to bring printed paper materials, including source codes, reference books, dictionaries, etc. But he knew that maybe it was the other party's absolute self-confidence. It's all at this point, it's too late to bring it!

"Hmm, you two backpacks are bulging, what are you carrying?" At this time, Han Jiongda looked at Wang Hanfei and Mo Kong, and found that the backpacks of the two goods were bulging, and they must have packed a lot of things.

"No, nothing, all sorts of stuff. Wang Hanfei said secretly. They are very afraid of Han Jiongda.

Soon, you will be at the inspection entrance.

Examinees are subject to strict checks before they can enter. In order to prevent them from bringing in any cheating stuff.

Entrance.

A middle-aged uncle said solemnly: "The team members are not allowed to carry any electronic devices. Printed paper materials including source codes, reference books, dictionaries, etc. are permitted. Open your backpacks!"

Xiao Jun didn't bring anything, so he was tested by the electronic detector and passed without finding that he was carrying an electronic instrument.

At this time, Wang Hanfei and Mo Kong opened their backpacks, and they were all snacks inside, no, it seemed that there were still some books.

"Teacher, can we bring snacks in?" Wang Hanfei asked pitifully. The exam is five hours, and you can't bring your phone in. I can't help Xiao Jun, how can I spend these boring five hours and can only eat snacks?

"No, there is free bread and water to receive here, you can bring some in if you are afraid that the exam will take a long time and you will be hungry!" The middle-aged uncle saw Wang Hanfei and Mo Kong bring a bunch of snacks, and his face instantly darkened. He had never seen a student come to take an exam like this!

"Huh, can't you bring it?" Mokong's face collapsed in an instant.

"Teacher, can I bring these books in?" Wang Hanfei took out two books from the bottom of his backpack, "Wanjie Science and Technology System" and "Deep Sea Developer".

"Web novel?!" The middle-aged uncle and teacher saw this, and his face became even darker. He was very skeptical that these goods were here to participate in the ACM competition, and that he didn't have any reference books and dictionaries. You even bring online novels into it to read? You use the time of the exam to read online novels?

However, there is no rule that you are not allowed to bring books in.

He looked through it, but didn't find any camouflage, and waved his hand impatiently: "Let's go!"

"Thank you, teacher!"

Han Jiongda, who was following behind, almost exploded when he saw this.

Fortunately, he knew that Wang Hanfei and Mo Kong were accompanying the students, otherwise he would have gone crazy.

You can come over to the exam and bring a bunch of snacks, and there are web novels!

Anyway, the candidates in the queue at the back were all stunned when they saw this situation.

", those three guys in front of you are awesome!Are you here for the exam or for a tour?Snacks + online novel physical book = 666!"

"How did they pass the school selection? And how did they pass the domestic pre-selection?"

"It can't be shady, right?"

"Why are they so showy?"

……

"Auntie, can you get the bread and water here?" Wang Hanfei walked to the place where he received the bread and water for free.

"Yes. ”

"Give me six......! The snacks were confiscated, and I had to nibble on a few more pieces of bread to pass the time. ”

"I'll have six too!" said Mökong.

Aunt:......

Most of the candidates in other people's families receive water, and few people receive bread. After all, the exam is pressed and there is no time to eat at all. It would be nice to have time to drink water.

These three guys are good, it looks like they are going to have a big meal in the exam room!

After receiving the things, Wang Hanfei said with emotion: "I didn't expect that this ACM Intercontinental Qualifier was quite thoughtful, and the bread and water were ready. I'm afraid that the candidates will be hungry after five hours of struggle!"

"Nonsense, five hours of exams. A lot of people were hungry at noon. If you don't bring snacks or bread, you'll be scolded to death!"

"You two, you can't affect Xiao Jun when the time comes to the exam, you know?!" Professor Han Jiongda finally couldn't help it.

"Knowing the professor, we'll be reading quietly next to us. Wang Hanfei swore solemnly.

Han Jiongda: ......

I entered the exam room and found my place.

Han Jiongda could only go to the audience and wait.

This intercontinental qualifier, there are still many people who come to watch.

However, the situation of Xiao Jun's team is still seen by many candidates around. Because, they are so individual!

"Hey, that team over there really has a personality. Didn't bring any books with you, but a bunch of bread and water?"

"I'm not mistaken, right, those are online novels?"

"They look very relaxed, and their mentality is so good!"

"What about the school?"

"Kyokyo University's ~ seems to be ......"

"Shhh...... Awesome!"

There are still ten minutes left before the start of the exam.

Everyone was seated.

The radio began to read out things like the discipline of the examination room.

Ten minutes passed quickly.

"Exams, start now!"

Xiao Jun sat in front of the computer and saw that the questions had appeared on the screen, and there were still eight questions.

And Wang Hanfei and Mo Kong sat on the side heartlessly, nibbling on bread while reading online novels. Because even if they help to read the question, they can't understand it!

Title: Statement of the Problem

We say that a number is a palindrom if it is the sane when read from left to right or from right to left. For example， the number 75457 is a palindrom.

Question gist of the question: Give a decimal number n, determine whether n will ask in x-base, x∈[2,16], and output x.

……

After reading the problem, Xiao Jun's well-developed brain immediately understood the problem, and at the same time began to emerge a way to solve the problem.

After all, he has a mastery of software programming, a mastery of mathematics, a master of black, and a lot of computer knowledge with Halliday.

Plus his IQ of 150!

"Today, I'm going to challenge the speed of one question in 2 minutes!" Xiao Jun said secretly in his heart.