Defend Namsan Park

Find the shortest distance between two opposite points on a sphere, which should be a geodesic.

Old Man Ji held an apple in his hand and raised it high for everyone to see. He used a toothpick to draw a semicircle along the equator on the surface of the apple. This is the geodesic line between the two points before and after the apple.

The circumference of the earth is about 40,000 kilometers, so the length of this geodesic is 20,000 kilometers, which is the theoretical shortest distance.

Old Man Ji put the toothpick back into his mouth, holding it like a cigarette, facing everyone in the conference room, and asked sternly: But can we make it shorter?

can.

He pinched the sharp toothpick hard and slowly pierced the apple in his hand in front of everyone's eyes:

Twelve thousand kilometers!

So the tower was built.

The fourth-generation machine Dayi is a product launched by Science City 314 Factory in direct competition with the missile route. As the first giant machine with long-range strike capabilities in human history, it no longer uses a dagger for close combat, but a kilometer The replacement of the divine bow that killed enemies, "Kambara Brahma Temple Dragon-Subduing Thunderbolt" is the brand new "Bharat Brahma Temple Dragon Emperor Stangang".

The effective range of the Bharat Brahma Temple Nagandi Stangun is one thousand meters. Although it is a behemoth with a length of nearly 90 meters and a weight of 64 tons, its range is actually almost the same as that of sniper rifles commonly used by humans. , the insecticide restrained by the strong magnetic field begins to escape after leaving the accelerator tube, and loses its effectiveness and returns to zero when it reaches one thousand meters. It is not so much a sniper rifle with precise point-killing, as it is a super large spray gun. son. The range of one thousand meters is obviously not enough to penetrate the entire earth and kill the Snail Angel in the sky over South America, which is 12,000 kilometers away, so humans decided to build a larger, more powerful, and longer-range Balat Brahma Temple Dragon Emperor Stan Gang, in the plan, is a giant gun four hundred meters high and vertical to the ground.

There are now five engineering divisions stationed in Nanshan. As soon as the superiors gave the order, the exploration experts began to look for suitable construction sites everywhere. In fact, there was no need to look for them. When they looked up, they saw that Chongqing has such a unique advantage. The tall building The building stands out there, standing out from the city skyline: Chongqing World Trade Center.

The Chongqing World Trade Center was once the tallest building in southwest China and is now the tallest building in human society. It is 151 meters tall and has 151 floors from top to bottom. There is an apron on the top of the building and a light rail line on the bottom. Wangjialing River, adjacent to the Liberation Monument, is the CBD of CBDs. It took only three days for the Joint Index Center to clear out this building and all the buildings within meters around it. Engineers from the Corps of Engineers, Base and Science City Quickly move in with big and small bags - obviously, it is unrealistic to build a -meter-high tower from scratch like pulling onions on dry land. Since there are ready-made high-rise buildings, it is better to make use of them. The Chongqing World Trade Center is the only one in human hands. A super high-rise building nearly meters high. There is no such building in Chengdu, Mianyang, Yibin, or Bazhong, so the work fell on .

get through!

Complete it from top to bottom!

Old Man Ji was one of the main persons in charge of the project. He held the blueprint in his hand and showed everyone how to penetrate the entire 62nd floor of the World Trade Center and insert the giant gun inside.

From a certain perspective, Mr. Ji is a complete supporter of God's engineering. He loves the magnificent man-made giants, the majestic engineering power, and the divine hand that can move mountains and reclaim seas. He despises missiles and conventional weapons. He despises all behaviors that shrink the head and tail. Vacuum tube core steam-powered giant machines like "Chaofeng" are his favorite. If conditions permit, he wants to build a 150-meter-long chain saw that emits a sound when started. The smoke and roar like a locomotive, the insecticide bound by a strong magnetic field running in the saw blade, just like the high-temperature plasma in a tokamak device - these are the weapons that Xiaofeng should master.

"Twelve thousand kilometers, is it possible?"

Shanglu sat far away on the curb, holding the white safety helmet on his head. Under the setting sun, the glass curtain wall of the Chongqing World Trade Center shone brightly, as if burning with flames.

"Anti, anti, anti, anti, anti, anti, anti..."

"Anyway."

"Anyway, the missile... can't hit that far." Wei Mao sat side by side on the curb, spinning the white Rubik's Cube in his hand, "Use the big Yi... to death, to death, to death, to death..."

"A dead end."

"Death... a dead horse should be treated as a living horse." Phytolacca comes to the construction site every two days for duty. Although he doesn't know what he can do here, Phytolacca neither understands civil construction nor construction. During the equipment installation, he could only wear a safety helmet and wander around like a supervisor. At first, he pretended to point and point like a leader, but soon the workers saw that he was a fool and thought he was in the way, so they expelled him. Then he got closer to the construction site, so Shanglu sat there far away doing nothing. It was okay to do nothing. He was so busy. He went out in the morning to beg for food and came back to deal with casualties in the workshop in the afternoon. It was rare to have time to take a breath. If Wei Mao It would be better not to come to yourself.

Wei Mao takes up a lot of Phytolacca's idle time, which is what Phytolacca is most dissatisfied with. Phytolacca wants to be in a daze so much, he wants to turn into a stone statue.

Large trucks with eight wheels ran over the road in front of the two people one after another. Each truck carried dozens of tons of cables. After seven months of construction, the intentions of the Joint Center and 151 had been At first sight, they used the Chongqing World Trade Center as the basic framework to transform it into a -meter-high super weapons platform. The originally smooth glass curtain wall building now looks like it is covered with vines, and the exposed cables, towers, The sensor is like a tumor growing on a limb. It is still growing, not like a dead thing, but like a living thing.

"What are you going to do with so many cables?"

Phytolacca could not see the end of the transport convoy at a glance.

"Degaussing."

Wei Mao lowered his head.

"City, city, city... The advantage of building in urban areas is that there are ready-made platforms that can be used. The trouble is that there are too many magnets. Hard and soft magnets are everywhere. I, I, I... It took us a long time to build the platform within a hundred meters. All the metals that can be found are..."

"It's all cleared up," Phytolacca said. "It's hard to listen to you."

"Yes, yes, yes... they have all been removed, and not a single iron nail has been spared, but but but but but... But the reinforced concrete inside the building structure and the iron oxide in the underground soil cannot be removed. Use cables to demagnetize..."

"How much influence do they have on the Nagatishan Gang of Bharat Brahma Temple?"

Shang Luxin said what a damn name this was.

"Small." Wei Mao replied, "But it's ridiculous..."

"A slight error can make a difference of a thousand miles."

"Correct."

An ultra-long-distance sniper attack of 12,000 kilometers is a hair's breadth of error, not to mention a blind sniper shot from East Asia to South America. This ballistic path does not follow the geodesic, but traverses the geodesic. , it is necessary to accurately consider the effects of gravity, magnetic field, vibration, and even the Coriolis shift caused by the rotation of the earth. On a very large scale of 12,000 kilometers, if the muzzle deviates by one arc second, the bullet will deviate from the target by fifty meters. If the muzzle of the gun deviates by one arc minute, the bullet will deviate from the target by 3,500 meters. This is the most difficult sniper attack in human history. It is difficult to imagine that humans have this ability, but the Joint Fingerprint Center says it does.

And the person with this ability is just sitting next to him and stammering.