On a new day, the bell rang for the first class.

But the students in the fourth class of the first year of Shield Bridge Academy were surprised to find that none of today's math professors showed up when the bell was about to end.

The bright morning sun suddenly obscured a dragon, and a dragon suddenly appeared outside the window, and he became smaller and burrowed into the classroom, and then changed into Babbage's old form.

"It's so dangerous, I almost got a full attendance bonus. Professor Babbage breathed a sigh of relief as the bell for class stopped.

Seeing the students' curious and disappointed looks, Professor Babbage said, "I'm sorry to disappoint those students who thought I would skip class today. ”

"In last night's game, the rich Charles came up with a new trick, and I discussed it with my teachers and classmates for a long time. ”

As soon as he finished speaking, the students present felt for a while, remembering the horror of Professor Dragon's time when they had studied topology not long ago.

In order to prevent the professor from bombarding himself with new knowledge, the class president, Calvin Redkin, decided to change the professor's topic and resolutely raised his hand to ask for questions.

Professor Babbage was very surprised by Calvin's question, and before he could say what method Charles used this time, this classmate was in a hurry to ask, and sure enough, he was a good boy who was diligent and inquisitive, no wonder that Charles would let him take care of him more.

After receiving the professor's gesture, Calvin got up and asked, "Professor Babbage, I have a reluctant request, can you tell us about your teachers and classmates?"

Professor Babbage didn't talk much nonsense in class, and usually started teaching after two minutes of blowing the ox, and if he was asked to blow the other dragons, the time would have passed, and then everyone happily opened the textbook and continued the lesson.

The step-by-step learning in math class is already a headache, and people no longer want to be bombarded with extra knowledge.

Professor Babbage looked at Calvin and said, "You said they, the one I discussed with me last night was one of the great elders of the Dragon Senate, the 'Venerable Integral' Leibniz, the seniors had the 'Hundred Calculation Divine Dragon' Gauss, the 'One-Eyed Divine Dragon' Euler, the younger generations had the 'Curved Demon Dragon' Riemann, the 'Ten Thousand Paths Returning to the Sect' Poincaré, in addition to Cantor, Frecher, Brouwer, and so on, these juniors who are not yet very famous. ”

And then the students, including Calvin, were all in the circle, and no one had ever heard of these dragons.

Professor Babbage clearly anticipated this, and said: "It doesn't matter if you don't know them now, we have recently had a bit of a difficulty working on a model of the spread of an infectious disease, and the steps of Charles's occupation of the island last night were very interesting to everyone, so they decided to visit Maccaden at the college soon to discuss some issues, and you will know each other by then." ”

Then the professor said, "You don't understand the complicated questions, in fact, I am also confused, because my research direction is not this." ”

﹏﹋¤-?? ﹏﹋

Then he drew a picture on the blackboard and said, "Let's play a little game, there are two islands in a river, and there are seven bridges connecting the two islands to the banks of the river like this." ”

"The question arises, how can we walk seven bridges at once without repeating or omitting them, and finally return to the starting point. ”

"The deeper question is, what is the principle behind this?"

Finally, Professor Babbage glanced at Calvin and said, "This question has to do with the strategy of transporting resources to the fleet after Charles's occupation of the island last night, and you, as his cousin, must think about it." ”

Calvin was stunned for a moment, how could a pot fall on his head from nine days away?

If it weren't for the fact that his cousin had not been able to find anyone in public, he would have had the mind to die with him.

What followed was predictable, and Professor Babbage's "Seven Bridges Problem" became a nightmare for the students of Shield Bridge Academy.

In the use of magic, there has been a dilemma similar to the "Seven Bridges Problem", and when designing the circuit of the magic circle, there is sometimes a problem of overlapping magic flow channels.

In the past, to solve such a problem, the first thing was to optimize the path, and when this could not solve the problem, it was only possible to set up an "overpass" to solve it.

However, as soon as the "overpass" appeared in the magic array, it meant that the two-dimensional plane magic array became a three-dimensional magic array, and its difficulty in using it immediately increased by a level.

Taking advantage of the heat of the game, the students of Shield Bridge quickly spread this nightmare to other academies.

Many people who have in-depth research on magic arrays have resonated and said that the study of this issue is very important.

In the evening, at the house of the old man Wolfe, the old man was in the living room with a piece of parchment and a sad face.

Diana came over with a cup of hot drink, put the cup on the coffee table, sat next to the old man and asked, "What are you looking at?"

Like other students who made it to the round of 16, she was given a few days off to prepare.

The tactics used by the account "Charles" last night were extremely weird, and although they won the game in the end, they didn't look like Ru's style.

While there is a chance that someone will use the "Nine-Rank Tapering Invitation Tactic" to meet the enemy, fighting with a large number of slimes is contrary to the teachings of the cultists of the multi-turret gods.

If someone else commanded it personally, then this battle was a group of warships full of magic crystal cannons who took the initiative to attack and bombard the opponent's lair.

Diana's only conclusion was that Charles had been "stolen", but it was not easy to steal numbers in the dream platform, so she thought about this issue for a day today.

So Diana, who hadn't left the house for a day, didn't know about the spread of the "Seven Bridges Problem" among the island's colleges in a short period of time.

Old man Wolf handed the paper to Diana and said, "This is what Erbach gave me, let me walk the whole bridge and return to the original point without repeating it, you see how to go?"

Diana studied the pattern on the parchment without changing her face, thinking that this must have been the result of last night's "Charles" game.

In addition to the route strategy when occupying the islands in last night's game, the strategy of transporting resources between the islands was also very clever, so that all the islands completed the fortress construction in the shortest time, so that the enemy gave up the plan to take the islands to obtain resources and rest, and was led by the nose to send the fleet into the ambush circle of the final decisive battle.

According to the usual routine, Diana should come up with a full solution to help her grandfather show off in front of Erbach, and then her fame will spread throughout the colleges.

But she didn't do this, as the saying goes, "the greater the ability, the more overtime", she herself has things to do including Intel's magic brain research and development and the research and development of artificial humanoids in Wisteria Academy, what if she shows her talent in mathematics and is caught by her grandfather to be a math teacher, this kind of thing is done by the old man, she doesn't want to spend time preparing for classes and correcting homework.

In particular, the level of human mathematics is a bit sad, and she is afraid that she will collapse when she changes her homework.

As the saying goes, "everyone gathers firewood and the flame is high", and everyone studies together is the real research.

So she shook her head and said, "If you simplify the bridge, the shore and the island into points and lines, you will find that this is actually a mathematical problem. ”

Old Man Wolf thought about it with a hot drink, and considered whether the college needed to invest more in mathematics.