On the south side of the palace of Gusu City, the river converges into a lake, called Mingxin Lake. A pavilion is built around the lake, and along the meandering curve of the lake's shore, the pavilion extends into the lake, and then a high platform emerges from the water. There are three layers of the high platform, there is a horizontal plaque hanging on the top of the platform, the three words "Boxin Terrace" are written on it, from the first floor of the Boxin Terrace to extend to the center of the lake, it is a water platform, this platform is just located in the middle of the lake, whether it is from the Boxin Platform or from the pavilion corridor around the lake, you can watch the song and dance on the platform.

At the beginning of the night, the moon is thousands of miles, the festive atmosphere is more intense, people gather at the water's edge to taste wine and enjoy the lotus, and enjoy the most beautiful time of the year.

In the pavilions, corridors, streets, and alleys, the lights are brilliant everywhere, and in the bright lake, on the flowing water, and in the palms of the hands, the lotus lamps are dotted.

At this time, Gusu City is like the reflection of the Milky Way in the mortal world. Boys and girls indulge in singing and dancing by the water, chanting poems against each other, or placing lovesickness on candles, or putting pride in wine glasses.

Heyu early in the morning to the pavilion corridor from the nearest position from the heart of the platform, a pot of silk wine, a few fresh peaches from their own trees, plus a little dim sum, a group of people in the pavilion to watch the lanterns and admire the moon, chanting poems against each other, so unhappy.

A few lotus lamps floated here and there by the lake, and the candles were like stars in the sky, flickering brightly.

Frost Di lay on the edge of the pavilion corridor, staring intently at the drifting lotus lanterns, and after the lotus lanterns gradually drifted away, Frost Di said to Gong Hui Ran with anticipation: "Brother Gong Hui, let's also put lotus lanterns." ”

Without waiting for Gong Wanran to respond, He Yu panicked first, and while rummaging, he shouted anxiously: "I'm so angry!" I'm! These useless servants, I told them to prepare candles, what about candles?! What about candles?! Sister, don't worry, brother, I'll figure it out! Damn it! I'm going to punish them when I go back!" ”

Frost shook her head, "Brother, it's okay, don't blame them, let's go buy some." ”

Zhang Xun hurriedly answered: "Okay! Okay! Xiaoshuang, I'll take you to buy it! Brother Xiao Ran will go to play against the concubine in a while, don't make a mistake. ”

"Hmm."

Before leaving, Gong Wanran instructed Zhang Xun, "You bring the frost well, there are many people in the city, don't get lost." ”

"Don't worry! I see. ”

Zhang Xun patted his chest, and then dragged Shuang Di to the city.

The downtown area is full of people, and the crowded flow of people is filled with joy. In the downtown area, there are not only stalls selling snacks and gadgets, but also quizzes and poetry writing activities. Frosty was in a very good mood, it was the first time she had experienced such a lively festival, but she didn't know that there was danger behind the noisy city. In a narrow dark alley, a trafficker was staring at her from afar.

Zhang Xun and Shuang Di came to a stall, picked out some candles, paid the money and prepared to pack and leave. At this time, a little girl with double pigtails followed an old woman to buy candles in front of the stall, and the little girl was two or three years younger than Shuangdi, very lively and cute. When the girl picked up the candle, she accidentally bumped into Frost and hurriedly apologized, but Frost didn't care, smiled and waved her hand, and left with Zhang Xun.

As soon as Zhang Xun and Shuang Di walked back, they happened to see a group of people gathered around a small stall, and the vendor shouted, "Are there any smart people?" If you're smart enough, you'll win twenty copper coins! ”

Zhang Xun thought it was interesting and wanted to go over to take a look, but Shuang Di was also very curious, so he followed Zhang Xun to go with him.

When I came to the stall, I saw a pile of copper coins on the straw mat, and the vendor saw Zhang Xun looking at it curiously, so he said, "This son, do you want to play?" You know at a glance that you are a smart person and you can definitely win! ”

Zhang Xun asked curiously, "What is this?" How to play? ”

"See, there are twenty copper coins, exactly the same. Later, I'll show you a problem, and if you can complete the requirements, the twenty copper coins will be yours. ”

"Oh? Interesting, what's the title? ”

The vendor clutched a wooden board and said, "I can't tell you now, you have to give me four copper coins before we can start playing." Don't worry, it's not a trick here, it's just that I came up with this puzzle a few days ago, so I took it out to play with everyone. ”

"Hehe, interesting. Okay, I'll play with you. After that, Zhang Xun took out some money from his sleeve, and when he looked at it, he was surprised to find that there were only ten copper coins left. Only then did he remember that when he heard about Jieyin in the afternoon, he gave almost all the money to Jieyin, and it seemed that the money was only enough for him to play twice.

The vendor collected the money, pointed to the water clock behind him and said: "This problem is not particularly difficult, so I have to limit the time, see it, ten drops of water, if you can't solve the problem during this time, you will lose." ”

"Good! Come on. ”

Zhang Xun counted out four copper coins and handed them to the vendor, who accepted them with a smile, and then handed the wooden board to Zhang Xun.

The inscription on the board reads, "Of the twenty copper coins, there are now four face up, and sixteen face up, without looking at them or touching them, divide them into two piles, and in the two piles, there are as many heads up." ”

Zhang Xun read the question, and immediately felt very interesting, and was about to show it to Shuangdi, but was stopped by the vendor.

"Childe, this can't be done, you can't show it to others."

"What's wrong?" Zhang Xun was puzzled.

"Everyone else knows, hide aside and think hard, when you figure it out, come to me to pick up the money, then I won't lose it all?"

"Alright, alright, I'll figure it out for myself."

"Childe is smart, he will definitely win easily, but don't spread it around after winning, otherwise everyone will know, and I won't be able to put this mess down."

"Don't worry, I'll just have fun."

Then, Zhang Xun turned around and whispered to Shuang Di: "Xiao Shuang, when I have played, I will tell you what the game is." ”

Shuang Di nodded and said, "Brother Xiaoxun, come on!" ”

The vendor took out a pair of blindfolds and a glove, and asked with a smile, "Childe, let's start?" ”

"What is this for?"

"Didn't you say it, you can't see it or touch it."

"Okay, okay." Zhang Xun took the blindfold and gloves, and then paid attention to the water clock behind him, the water clock dripped a drop of water every once in a while, and the interval was about eight or nine heartbeats, it seemed that he didn't have enough time.

"Let's get started, shall we? Childe, please wear an eye patch and gloves. ”

"Hmm."

As soon as Zhang Xun put on his blindfold and gloves, the vendor counted: "One! ”

Zhang Xun used his gloved hand to flick the copper coins on the table back and forth, and he was clueless for a while. Shuang Di stood beside Zhang Xun, tugging on Zhang Xun's clothes tightly, she was fascinated, and really hoped that Zhang Xun would quickly solve it, and then test her too.

And at this moment, the trafficker also quietly stood behind Frost.

"Eight...... Nine...... Ten! It's time, Childe. ”

Zhang Xun took off his blindfold and said unhappily: "It's true, it's just that you've been counting there, so I don't even have the heart to think." ”

"That'...... Childe, why don't we try again? But you'll have to give me six copper coins this time. ”

"What?! Still with a price increase? Zhang Xun was a little angry.

"You still care about this money, didn't you say you just want to have fun?"

"Okay, okay, here you go, don't count this time!" Zhang Xun said as he gave the last six copper coins to the vendor, and then put on a blindfold.

"Okay, I'm not going to count this time. So here we go, one! ”

"Count!"

"My bad." The vendor slapped his mouth.

Although she didn't know what puzzle Zhang Xun saw, she knew that if someone as smart as Zhang Xun couldn't solve it, the problem would not be simple.

Shuang Di wanted to scratch her head, but as soon as she let go of the hand holding Zhang Xun, the traffickers behind her suddenly grabbed the corner of her clothes. Shuang Di was shocked, instinctively feeling the danger, so she hurriedly grabbed Zhang Xun again. Seeing this, the traffickers had to let go for the time being.

Frost turned around nervously, only to see that there was still a frolicking crowd behind her, and the onlookers were talking a lot, without any sign of danger. Frosty relaxed and thought to herself, maybe someone had just accidentally touched her.

"Ten! Childe, it's time again. ”

Zhang Xun took off his blindfold and counted the coins on the mat. Sure enough, it still doesn't work, although each pile is ten, but the number of heads up is different, he is very depressed, and said unwillingly: "No, come again!" ”

"Childe, then this time it's eight."

"Oops, no money."

The vendor smiled and said, "I'm sorry, Childe, I can't play with no money." ”

Zhang Xun couldn't swallow this breath, and said to Shuang Di embarrassedly: "Xiao Shuang......, my brother has no money, you have money?" ”

Frost felt in her pocket, and pulled out only four copper coins.

Zhang Xun said helplessly to the vendor: "That's it, let's go back and get the money, and come back to play with you later." ”

"That's not good, you must have figured it out all the way back, you will win when you come back, I won't play with you today when you leave, so let's do it, Childe, if you want me to say that you should go back, let others try it too."

Zhang Xun was unwilling, thought for a while and said: "In this way, I have a piece of peiyu, although it is not a fine product, but it is worth ten copper coins, give this to you, and I will play it for the last time." ”

Zhang Xun said as he took off Peiyu and handed it to the vendor. The vendor took Peiyu, looked at it, and said, "Okay, one last time." ”

Zhang Xun put on an eyepatch and was about to start, when the crowd of onlookers began to boil, and everyone was waiting to see Zhang Xun's liveliness.

Shuang Di felt that the crowd was getting more and more crowded, and the traffickers squeezed up with great strength, just between her and Zhang Xun, and quietly squeezed her to the other side. Shuang Di found that she was a little far away from Zhang Xun, and wanted to reach out to grab Zhang Xun, but she couldn't catch it, she tried several times, but in vain, and the person in the middle seemed to be deliberately separating her from Zhang Xun. Frost immediately realized the intense danger, and she looked up nervously, only to see that the man had an expressionless face, and there didn't seem to be anything unusual.

The vendor said, "So let's get started?" ”

Zhang Xun nodded confidently and said, "Okay!" Begin! ”