Killer Sudoku is different from standard Sudoku, and in general, this variant of Sudoku is more difficult than standard Sudoku. Killer Sudoku is a combination of Sudoku and number and combined gameplay, on the basis of standard Sudoku, Killer Sudoku has added the concept of "district", generally divided by dotted lines or independent colors and Sudoku's nine-square grid, Sudoku community conditions are limited, so the answer board is used to draw out the "district" with a dotted line, the sum of the numbers in each area, must be the same as the number marked in the upper left corner of the district.

The obvious difference between Killer Sudoku and Standard Sudoku is not only that there is an additional concept of "Zone", the 81 spaces of Killer Sudoku are empty, and the player needs to use the number and concept of "Zone" and the rule that the numbers in each row, column, and house of Sudoku cannot be repeated, and solve the correct and only answer under these two constraints.

In fact, compared to standard Sudoku, Meng Jiangbei found that a variant of Sudoku like Killer Sudoku was more interesting.

Yuan Chuyue came over to join in the fun, she has always played a lot of standard Sudoku, and there are very few deformed Sudoku like this, and she only knows some basic solutions. She stared at the topic and thought about it for a while, before she vaguely came up with the basic solution to the killer Sudoku.

The key to killer Sudoku is to solve the sum of numbers, and it seems that the concept of "unique decomposition method" should be used?

Yuan Chuyue pursed her lips and frowned and thought, Meng Jiangbei had already started writing over there.

There is only one way to decompose some sum values in Killer Sudoku, after all, the basic constraints of Sudoku are there, and the numbers in each row, column, and house cannot be repeated, which means that if a certain area falls within the range of these three definitions, the numbers cannot be repeated. The simplest, such as a group of 2, can only be paired with numbers 1 and 3 with a value of 4, and can only be paired with a number of 8 and 9 with a value of 17.

Of course, solving a whole killer Sudoku problem is not that simple, and it requires a considerable amount of computation.

Cui Xiaotong is a little similar to Meng Jiangbei in Sudoku, Meng Jiangbei likes to challenge new things and challenge difficulty, while Cui Xiaotong likes all the bells and whistles, even if he is an engineering man, it can't stop him from liking fancy things, whether it's clothes or Sudoku.

If it was placed in the past, Cui Xiaotong's strength level was not as good as Meng Jiangbei's, but now it is different, Meng Jiangbei had a severe cold, and he took a few cold medicines before coming, and there were some sleeping ingredients in the cold medicine, Meng Jiangbei was dizzy, and he bit the tip of his tongue to maintain such a clarity.

It is said that impulse is the devil.

Meng Jiangbei is destined to pay a terrible price for this impulse.

Four minutes and twenty-one seconds, Cui Xiaotong closed the pen.

In four minutes and twenty-three seconds, Meng Jiangbei could write down the last number.

Wen Yufei got the answer right and looked at Meng Jiangbei cautiously: "The answers are all right, Cui Xiaotong is two seconds faster......

Meng Jiangbei only felt dizzy, and Wen Yufei's voice reached his ears like there were a hundred sparrows chirping in his ears, which was very annoying. He subconsciously waved his hand, as if he wanted to drive away the noisy sparrows in his ears, before his hand was raised, and the whole person suddenly fell back, Wen Yufei's eyes were quick, and he protected Meng Jiangbei with his broad mind.

Meng Jiangbei fainted.

Yuan Chuyue saw the scene in front of him, and subconsciously said: "Isn't it just that you lost a PK? This makes me faint in anger? Senior Wen, are the members of your Sudoku Club so poor in psychological quality?"

Yuan Chuyue said, "tsk" again, and sighed: "The name Killer Sudoku sounds unlucky, and it has its own evil spirit. ”

Everyone: "......"

Wen Yufei felt that Meng Jiangbei had rejected Yuan Chuyue's confession, so that Yuan Chuyue loved and hated him so much.

Meng Jiangbei of Sudoku F4 fainted in anger because he lost a game, and if this is spread, it will definitely become an indelible piece of black history in Meng Jiangbei's life.

It's still the kind of black history that was painted with the thickest marker.

Wen Yufei silently gave Yuan Chuyue a thumbs up.

Illness comes like a mountain, and illness goes like a thread.

Meng Jiangbei, who was "extremely poor in psychological quality", lay on the bed for two days before he came back to life, during which Wen Yufei came to condole, out of the spirit of humanitarianism, he shook out some details of Meng Jiangbei's fainting that day, and brought Yuan Chuyue's most sincere advice.

Wen Yufei said seriously: "The original classmate thinks that your psychological quality is too poor, which will seriously affect the atmosphere of our club. ”

Meng Jiangbei: "......"

Wen Yufei also asked: "Did Yuan Chuyue confess to you, and you rejected her?" Hey, Lao Meng, didn't I say, it's rare to have such a good-looking and blind girl take a fancy to you, what do you want to do with Qiao if you are not satisfied?"

Meng Jiangbei directly drove Wen Yufei out of the dormitory.

Yuan Chuyue confessed to him? Well, if the conversation at the dessert shop in Cheng Yu's community that day was a confession.

He rejected the original Yue?

Meng Jiangbei fell into deep thought.

Did his performance that day count as a rejection?

Meng Jiangbei didn't think about a reason, he wore a mask and went straight to the school hospital, his cold had not fully recovered, and he still needed to go to the school hospital to be diagnosed and get some medicine by the way.

Meng Jiangbei didn't expect to meet Yuan Chuyue in the school hospital, he just came out of the internal medicine department, and saw the other end of the corridor, Yuan Chuyue was holding a child wearing the uniform of the kindergarten affiliated to Dongqi University and hurriedly ran to the surgical department.

This has nothing to do with Meng Jiangbei, not to mention that this woman pretended not to know herself two days ago.

Meng Jiangbei thought so, but his feet limped and followed Yuan Chuyue into the surgical department. In fact, the moment he stepped into the door of the surgical department, Meng Jiangbei regretted it a little, feeling that he was a little nosy, but now it seemed a little deliberate to turn around and leave, Meng Jiangbei pursed his lips and sat down next to the bench at the door.

The doctor thought that Meng Jiangbei came with Yuan Chuyue and didn't care, and Yuan Chuyue didn't notice Meng Jiangbei at all.

The child in Yuan Chuyue's arms was chubby, with two bubbles of tears in his eyes to cry or not, and he was still holding a pink lollipop tightly in his hand, he sniffed, held back his crying, and carefully licked a lollipop.

Strawberry flavored, so sweet.

The doctor asked, "What's going on?"

Yuan Chuyue explained clearly in a few words: "This kid fell off the wall, and the wall is not high. He was crying so much just now, I'm afraid I'm hurting somewhere. ”

The doctor examined the child, pressed his limbs, lifted his clothes and looked at them, and asked a few words carefully, but the child said that it was not painful, so he came to a conclusion: "It should be scared, it's not a big deal, the knee is knocked, and the skin is not broken, just go back and apply some medicine." ”

Yuan Chuyue was relieved and thanked the doctor before pulling the child out. When he arrived at the door, Meng Jiangbei, who was still sitting on the back of the chair, immediately straightened his back, but Yuan Chuyue didn't even look at him, and walked out in front of him with the child.

Meng Jiangbei: "......"

Very good!

Meng Jiangbei sulked for a while, then stood up, walked out slowly, and found that Yuan Chuyue and the child hadn't left yet, the two stood at the door of the bathroom, the child raised his head, and said glutinously: "Shhh ”

Yuan Chuyue hesitated: "Then hurry up, I'll wait for you outside the door." ”

The child stuffed the lollipop to Yuan Chuyue, and the little ghost instructed: "Don't steal it." ”

Meng Jiangbei simply stopped, leaned against the wall and raised his eyebrows at this scene.

Yuan Chuyue didn't go far, just stood at the door of the toilet waiting for the child, Yuan Chuyue reached out and stroked her hair, Meng Jiangbei found that her sleeves were a little dirty, and there seemed to be a trace of red blood in her palm.

Meng Jiangbei narrowed his eyes.

Three minutes later, a child came out of the bathroom, wearing the uniform of the kindergarten affiliated to Dongqi University, he walked slowly to Yuan Chuyue's side, Yuan Chuyue stared at him for a while, his eyes fell on the school uniform logo on his chest, and he gave him the lollipop in his hand, making a gesture to lead him away.

The child was stunned.

Meng Jiangbei raised his eyebrows.

Almost at the same time, another child walked out, just in time to see the picture of Yuan Chuyue stuffing the lollipop from the previous child, his eyes widened in disbelief, and suddenly opened his mouth, "Wow", and cried out: "Tuan Tuan lollipop!"

Tuan Tuan is sad, he has experienced his first betrayal in his life when he is only five years old!

Yuan Chu Yue has a headache.

It's a real headache.

It took her half an hour to coax the big demon king of Tuan Tuan, all the way from the school hospital to the school's faculty and staff residential area, Tuan Tuan still flattened her mouth and looked unhappy.

Neither of them noticed, followed by a bored man.

Tuan Tuan pouted: "Yueyue, didn't you recognize me again." ”

Yuan Chuyue swore an oath: "No, no, no, it was the lollipop that fell to the ground, and I thought I couldn't waste it before I stuffed it into that kid." How can the lollipops that fell on the ground give us a tufta to eat!"

Yuan Chuyue did not hesitate to shape himself into a ruthless old witch image, Tuan Tuan reluctantly accepted Yuan Chuyue's reason, the two stopped in front of a wall that was not too high, the wall was full of creepers, looking a little desolate, at this moment there was an orange kitten lying on the wall, the kitten's left leg seemed to be a little lame, and the right ear was also missing a corner, looking a little weird, at the moment it was lying on the wall motionless.

Tuan Tuan sighed like a little adult: "Mom promised me that I could have a cat, but why didn't Xiao Tang come home with me?"

There are a lot of wild cats in the school, especially in the faculty dormitory, many old professors are kind-hearted and often take some cat food down to feed the cats, so the wild cats in this area are fat and strong, and they are not very afraid of people.

On the other side of the wall is a lawn, where the sun is particularly good, especially in the winter afternoon, the wild cats in the faculty dormitory like to gather in that area to bask in the sun, and at this moment there are four or five wild cats gathered on that lawn, licking each other's fur and snoring comfortably.

There is a cat slave in Meng Jiangbei's dormitory, he heard from his cat slave roommate that there is a lame kitten in the faculty dormitory that is only missing half an ear, and has been rejected by this wild cat, and there are a few kind teachers who want to adopt the kitten, but the kitten seizes the opportunity to slip out, and every time he can see it lying on the wall that it takes a lot of effort to climb on the wall that other wild cats can easily jump on, and look at the wild cats on the other side of the wall.

Yuan Chuyue rubbed Tuantuan's head: "Don't climb the wall in the future." ”

Tuan Tuan muttered: "I'm afraid that Xiao Tang won't be able to come." Mom said that Xiao Tang's leg was injured and it was hard to climb the wall, so why did it spend so much effort every day to climb the wall. ”

Yuan Chuyue looked up at Xiao Tangerine on the wall, and her eyes were dazed for a moment.

"Probably because...... Don't be reconciled. ”

"Unwilling?"

Yuan Chuyue patted Tuan Tuan's little head: "I am unwilling to be different from other cats, and I try to prove to them that it is also a normal kitten, and what other cats can do, it can too." ”

The wind blew, and the words that Yuan Chuyue said clearly fell into the ears of Meng Jiangbei, who was not far behind him.

Meng Jiangbei's heart moved, and he suddenly had a strange feeling, why did Yuan Chuyue's words carry a trace of sympathy?

Tuan Tuan was still young, so he didn't understand Yuan Chuyue's words very well, so he blinked and said, "But, it's difficult, isn't it?"

Yuan Chuyue sighed: "No matter how difficult it is, you can't give up." After all, our little orange is also an excellent kitten, how can it be easily defeated. ”

Tuan Tuan was ignorant.

He doesn't understand the truth anyway, and what is "also"?

Tuan Tuan jumped home, and before walking into the faculty dormitory building, he suddenly turned around and beckoned to Yuan Chuyue, and said in a milky voice: "Yueyue, next time you can't recognize Tuan Tuan Tuan again." ”

As he spoke, Tuan Tuan raised his hand, revealing the red rope tied to his chubby little wrist, and a small golden gourd fell from the red rope.

"Those who have gourds are Tuan Tuan. ”

Children are easier to deceive than anyone else, but children's hearts are purer than anyone else.

Yuan Chuyue was stunned for a moment, then suddenly smiled, bent his eyes, and the small dimples on his cheeks seemed to be filled with a nest of sweet wine.

You stand on the bridge and look at the scenery, and the people watching the scenery stand under the bridge and look at you.

Yuan Chuyue smiled at Tuan Tuan, Meng Jiangbei looked at Yuan Chuyue's beautiful little dimples, the wind blew the broken hair on her forehead, she blinked, Meng Jiangbei suddenly covered his chest, and for a moment, he felt like a feather gently swept his heart.

Yuan Chuyue lifted her broken hair, and her eyes inadvertently fell on Meng Jiangbei on the side, as if she had just seen a stranger, the expression on her face did not change in the slightest, and she took it back carelessly, raised her feet and walked away.

Meng Jiangbei: "......"

A handful of anger rose in Meng Jiangbei's heart, and he burned the messy feathers completely.