The sun is scorching, and little Huajuan has the potential to be a big brother. He is fierce and will not let go once he grabs hold of something.
"Isn't he fat?"
"Say it again, please."
"Fat~pig~"
The children cursed at each other, pointing fingers at each other, and the situation, which had been eased, became more intense.
Lin Chaoxi slammed the table and stood up. In a flash, Huajuan punched Lu Zhihao in the face. Zhang Liang's mother was stunned. She screamed loudly and waved the bag and umbrella in her hands to hit Huajuan.
Lin Zhaoxi wanted to rush over there, but it was too late...
Suddenly, a burst of electronic sound shrieked, the sound was high and sharp. Lin Chaoxi subconsciously covered her ears, but she suddenly remembered that there seemed to be such a sound during the last mental arithmetic king, the sound of the loudspeaker.
Old Lin!
She forced herself to open her eyes and look towards the source of the sound. Sure enough, Lao Lin, wearing a management uniform and holding a loudspeaker, was walking lazily towards her on the lawn.
He somehow turned on the horn, and it stopped shrilling, and the notes of "Happy Birthday to You" jumped out one by one, accompanied by Lao Lin's cigarette in his mouth and his unruly posture, which was quite ironic.
The children on both sides were stunned by this uncle and just stared at him blankly.
Lao Lin put the cigarette plug into a bunny-shaped trash can nearby, looked at the big words 1:0 on the ground, and asked, "Who told you to scribble and draw all over it?"
"They did it!" The little bastards from the Experimental Primary School were very quick to tell on others.
"Oh, let's clean it up later." Lao Lin said casually and turned to leave.
At this time, someone pushed whom again, and the primary school students started pushing and shoving again. Huajuan took the opportunity to kick Zhang Liang twice.
"Still fighting?" Lao Lin didn't hesitate, and turned back to stop the fight.
Lin Chaoxi almost suspected that Old Lin had eyes on the back of his head. When he turned around, Zhang Liang was about to push Huajuan away.
She pointed at Zhang Liang and said, "Uncle Administrator, he cursed and beat people when he lost!"
Lao Lin was also stunned. He didn't expect that she would change her words so quickly and then really make up a false accusation.
"You look so energetic." Lao Lin smiled, "Why don't you let your uncle help you with math problems?"
Lin Chaoxi guessed that when Old Lin said this, she wanted to see the children shouting "No" and "No" and running away, but maybe she and Zhang Liang played this game too coolly and aroused the children's interest in learning mathematics (?). The children from the Experimental Primary School and the Red Star School all looked at Old Lin eagerly, as if waiting for him to ask a question.
Lao Lin stood with his hands on his hips, holding a loud speaker, and looked at the children in bewilderment. The scene became awkward again.
"Uncle, what's the question?" Lin Chaoxi's good class monitor, Lu Zhihao, asked very helpfully.
"What topic?"
"Tsk, he's a liar," someone from the experimental elementary school camp shouted, "He knows nothing."
This was probably the first time that Lao Lin was told that he knew nothing about mathematics. It was a novel experience, but he stood still and enjoyed the pleasure of being in a superior position in the wind. It was simply perverted.
"Do you think they are powerful?" After enjoying the breeze for a while, Lao Lin lowered his eyes and asked.
"That's amazing!" the children said in unison.
"That's awesome."
Comrade Lao Lin took two steps and sat down where she had just sat. He moved the 85 stones on the table to one side, arranged 9 of them, and asked, "It's just basic subtraction, multiplication and division math problems. How come no one can do them? They haven't even heard of Bash game. What on earth are they teaching in elementary school math now?"
While complaining, Lao Lin said, "The student who is leaving over there, come here and sit here."
He pointed to the stone bench opposite him, where Zhang Liang had just sat.
Lin Chaoxi felt strange and looked around before he realized who Lao Lin was talking about.
At the edge of the rest area, there was a little boy in sportswear with his back to everyone, preparing to walk towards the merry-go-round.
It was Pei Zhi.
"Pei Zhi, this boastful administrator uncle wants you to come over!" Hua Juan shouted.
Pei Zhi was still walking, pretending not to hear.
"If you don't come over, this team leader won't approve your Eagle Team activity!" Huajuan shouted again.
Pei Zhi's figure suddenly froze. He turned around and could no longer pretend not to hear. He could only walk over and sit down obediently.
He lowered his head slightly, his hair covering his eyes a little, and looked very ordinary.
"I'm telling you, my classmate is amazing!"
Lin Chaoxi was grabbed by Huajuan excitedly.
I tell you my dad is great too... Lin Chaoxi wanted to say so, but she didn't dare to guarantee it as she looked at the two ordinary-looking people, one big and one small, sitting quietly on both sides of the stone table.
Exciting, so exciting!
"Simply put, this kind of two-player turn-based game is collectively called a combination game. Combination games have several characteristics: one, two players; two, taking turns to operate..." Lao Lin said, pointing at himself and Pei Zhi, introducing the definition and demonstrating, "Come, friend, pick up a stone.
Pei Zhi also raised his hand and took the piece.
He didn't react much, just sat there, and only followed Lao Lin's instructions when he moved. He didn't say anything, and didn't try to steal the limelight. Apart from his straight sitting posture and wrists that were much whiter than Zhang's, he was not very noticeable.
After Lao Lin introduced the definition, he started from the simplest number of stones and explained the principle. Although he always spoke in a condescending tone as if he was telling you this reluctantly, it was this attitude that aroused the children's unwillingness to accept defeat.
"Do any of you know that if I want to win if I take the stones first among so many, what rules should I set?"
"Four!"
"No, it's 3!"
"Can you do it?" Lao Lin asked in a drawling tone.
"3, that's 3!" A child came up directly, pushed Lao Lin away, and picked up stones with the person opposite him.
"oh."
Lao Lin was even naughty and secretly put one in there on purpose. Then he was pulled out by the kids and yelled at.
"Let me see if you are careful or not. Why are you so excited?"
He was really bad. Every time he asked a question, many people rushed to answer it. The children's faces were sunburned red and their foreheads were covered with sweat. The competition was very intense.
The atmosphere is very good now, and there are even parents bringing their children to listen. Lin Chaoxi looked at those furry little black heads, took two steps back, gave his seat to another child, stood at the outermost edge of the crowd, and squatted in the shade of the trees.
Then she remembered Zhang Liang.
Zhang Liang did not leave. He stood outside the crowd with his mother and talked to two other companions. He probably wanted to call others to join the Eagle Holiday Team activities, but he didn't expect that many of the little brats in the Experimental Primary School were attracted by Lao Lin and no one paid any attention to them.
Zhang's mother glanced down at her, and suddenly, it seemed like her cell phone was vibrating. She quickly opened her bag, took out her cell phone, and looked at the caller ID with excitement in her eyes, but she didn't rush to pick up the call.
She nudged Zhang Liang and pointed at the phone: "Liangliang, the summer camp list should be out now!"
Her voice was very loud and happened to hit the pause point in Lao Lin's speech, so all the children looked at her subconsciously.
Zhang's mother was stared at. She slowly answered the phone, but her tone was very earnest: "Hey, hello, Director Feng."
"How could it be possible? How could it be possible for you, such a busy person, to call me personally?"
"Oh, the summer camp list is out, right?"
"Our Liangliang did well in the exam this time, right? I still want to thank you."
"Full marks?"
Of course, Zhang Liang also had his little followers around him, who quickly pushed Zhang Liang and said, "Oh my God! You are so amazing!"
The children who were in the same group with Zhang Liang all had good grades. When they heard the results of the Jinbei Summer Camp selection were released, they all left the stone table and swarmed to Zhang's mother and asked, "Auntie, can you help me ask?"
"Auntie, there's me, there's me, Madden, Madden!"
Zhang's mother was surrounded by students, enjoying the treatment of being surrounded by children. She pressed her hands to signal everyone to be quiet, made the shape of "I'll ask", and then said to the person on the phone: "Director Feng, I'm sorry to bother you, I have a few children here, can you help them check their grades together?"
"Oh, did you ask your secretary to send it to me? Thank you so much."
Zhang's mother hung up the phone and tapped her phone with her fingertips, looking very proud. She patted Zhang Liang's head encouragingly and said to all the children in the experimental primary school: "When we have activities later, Auntie will treat everyone to Japanese food from Hotanju, as a celebration for Liangliang."
“Great!”
"Long live!"
Over at the Experimental Primary School, the students cheered and danced as if they were honored.
The atmosphere around the stone table was somewhat quiet. Only Huajuan spoke silently: "You guys also took the exam, don't you want to know the results?"
"Anyway, the exam is over, so why are you so anxious to know the results?" Lu Zhihao was taking the pieces, and the questions Lao Lin asked were a bit difficult this time. He waved his Huajuan paw impatiently.
"What about you?" Huajuan turned around and asked her.
Lin Chaoxi felt that the weather was too hot, so he squatted in the shade of a tree and looked up and said, "I'm sure I'll pass the exam. Is there any doubt about that?"
Little Huajuan said, "You are so arrogant!"
In front of the stone table, Lao Lin asked Pei Zhi: "Have you taken the exam?"
When Lin Chaoxi heard this, he was too hot-headed to pay attention at first. Three seconds later, he stood up and asked, "Why don't you ask me, but ask Pei Zhi?"
Pei Zhi was stared at eagerly by the strange uncle and could only nod.
"Then how about we celebrate as well?" Lao Lin said.
Lin Chaoxi became even angrier after listening to this and strode over. She felt something was wrong when Old Lin mentioned Pei Zhi. What the hell? Why did he care so much about Pei Zhi!
Dad, I am your daughter!
Lao Lin's voice was no longer casual, but serious: "In combinatorial games, there is a very special variation called the nim game. It looks simple, but it plays an important role in many models in game theory. It is extremely classic. Do you want to try it?"
Pei Zhi finally looked up at Lao Lin. He seemed to sense Lao Lin's seriousness and nodded, saying, "Okay."
Pei Zhi only said two words, but he was countless times more arrogant than Zhang Liang.
Lao Lin smiled. He divided the pile of stones in front of him into two parts. "The rules of victory and defeat are as follows. Take stones from several piles. Take a certain number of stones from any pile alternately. The minimum is 1. The one who takes the last stone wins."
Suddenly, the group of people from the Experimental Primary School started yelling. Zhang Liang's mother received a text message with the name list, and everyone was making a lot of noise.
"Auntie, I."
"What about me?"
"Don't worry, the list hasn't been sent out yet. There's another text message."
Here, Lao Lin briefly explained the rules and asked Pei Zhi: "Do you understand?"
Pei Zhi nodded and asked, "Shall I go first?"
Lao Lin: "Whether it's reasonable or not, you are so smart, shouldn't I go first?"
Pei Zhi didn't make a move, but just said, "Let's start over."
"OK."
Lin Chaoxi had already stood by the stone table again. She looked left and right, not understanding what was going on. However, from the way the two men moved the stones again and their reactions just now, Lin Chaoxi guessed that the first and second moves and the winner of the previous round had already been determined, so the two decided to start over.
Or is he not a human being?
"Lin Zhaoxi?"
Suddenly, she heard someone calling her name from a distance. She looked over subconsciously and saw the girl who called her name turned her head quickly, looking as if she had done something wrong. The people in the Experimental Primary School were huddled together and whispering, as if they were talking.
"It's really her."
“She went in, too.”
The originally high-spirited atmosphere in the Experimental Primary School gradually became low, and Zhang Liang's face became even more sullen.
Faintly, she also heard the names "Lu Zhihao, Pei Zhi...", and finally, it seemed that someone was saying "Huajuan".
The little boy Huajuan had been undercover there for a long time. After peeking at the list, he shamelessly ran back and pushed around: "Wow, you guys passed the exam, aren't you happy?"
All of them stood in front of the stone table with bated breath, except Huajuan who was getting excited.
"Be quiet." Lin Chaoxi held him and asked him to calm down.
If you take stones from the dry pile, the situation is very different from the situation with one pile. Now the number of stones on the table has become five piles.
3/5/7/19/50, Pei Zhi married a son.
This game definitely has a winning strategy depending on the number and the number of piles. Lin Chaoxi was also calculating, but before she could figure out the second step, Pei Zhi had already taken out 28 pieces from the pile of 50.
Lao Lin continued to add stones.
Later, Lao Lin and Pei Zhishi were so fast that their speed of taking pieces could not keep up with their speed of calculation. Lao Lin simply pushed all the stones on the table away, picked up a red brick from the ground, and quickly wrote three numbers on the stone table, representing the number of stones in each of the three piles.
Pei Zhi also picked up a piece of broken red brick and wrote three numbers on the table, representing the number of stones in the three piles left after he took them away.
Lao Lin also continued to write, one round after another, the numbers on the table became bigger and bigger, but it was obvious that Lao Lin was always faster than Pei Zhi.
"Didn't uncle say that we can't write or draw anything randomly?" Huajuan asked weakly.
Lin Zhaoxi: "It's none of your business."
In the end, both of them even gave up writing by hand.
"1203, 351, 9901... Whoever wins, I'll go first."
Strings of numbers were called out one after another. Old Lin sometimes asked about the rules, sometimes asked Pei Zhi to judge who would win first, and sometimes took turns counting with Pei Zhi. One question and one answer, one old and one young, the voices of the young man and the boy were not loud, one could even say they were very soft, but they sounded alternately, with extraordinary concentration.
Lin Chaoxi's calculation speed had long been unable to keep up, she could only judge the winner from the expressions of the two people.
Old Lin was still calm and composed. Although there was no change in Pei Zhi's expression, it was obvious that he was a little slower, and he was getting slower and slower.
Finally, the game ended and Pei Zhixian stopped. He looked at Lao Lin without saying a word.
The sunlight no longer had the warmth it had at noon and had become gentle, falling on the two of them.
Lao Lin laughed: "You are definitely smarter than me, but you are also definitely slower than me. Do you know why this is so?"
Pei Zhi shook his head.
Lao Lin: "Then do you want to know?"
"I want to know." Across the stone table, the boy put his hands on the table. His voice was still childish, but his eyes were bright and serious like an adult.
…
Later.
Later that day, they stayed to clean the amusement park because Lao Lin took Pei Zhi to learn a new game with them.
They ended up staying together to clean up the playground equipment.
Tidy up the rest area, wipe the railings, sweep the floor...
The setting sun became redder and redder, dyeing the clouds pink.
Lin Chaoxi didn't know what Old Lin had discovered about Pei Zhi. To be honest, that level of communication seemed like there was a layer of fog or a mountain between them.
Maybe it was the mutual admiration between geniuses; maybe Pei Zhi allowed Lao Lin to see his former self; or maybe, Lao Lin felt that only someone like Pei Zhi was worth teaching.
Lin Chaoxi didn't understand either.
They stood at the gate of the deserted amusement park and said goodbye.
"Then see you at summer camp." Huajuan waved at her and blinked. Her face was soft and looked very tender.
"Yeah." Lin Chaoxi reached out and pinched it.
"Let's beat Zhang Liang together in the summer camp!" Huajuan laughed.
"He's not that important." Lin Chaoxi and Lu Zhihao stood together and said to Huajuan and Pei Zhi.
Pei Zhi nodded and said, "Goodbye."
"See you at summer camp."
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