As one order after another was transmitted from the headquarters, a new round of mobilization at the local level immediately began.

In fact, it is a mobilization, which is nothing more than squeezing out some more people.

Under such a large flood, the people who can mobilize at the local level have already rushed to the front line. The local government's manpower, the Communist Youth League, the reservists, and the factory workers, as long as they are active, are basically cooperating with the local evacuation and dam reinforcement. In Qingping County and Liaoyuan County, even the prisoners in the prison detention center were pulled to the dam to drive piles.

Zu Qingsheng sat on a chair in front of the east wall of the headquarters, looking at the red and blue pencils on the map that represented the dangerous situation, and his heart was very anxious.

Although the waterlogging disaster this time is fierce, what has caused the current bitter fruit is the slackness of water conservancy work throughout the spring and summer.

As he said at the mobilization meeting before, this time half of it was a natural disaster, and the other half was definitely a man-made disaster.

In the busy headquarters, Li Xian and Xu Bing secretly lit a cigarette and squatted under the window.

Both of them had a sad face.

Li Xian was worried about Li You, while Xu Bing was distressed.

New Taipei Logistics easily picked up the retired trucks of the military region, and it has developed to the current scale, this time Li Xian resolutely came to the aid despite the opposition of everyone, and he was afraid that the loss would be not small.

Xu Bing, who regarded the truck as his heart's meat, felt a twitch in his heart when he thought of the truck he loved so much on weekdays trekking through the muddy water.

Next to the two, Liang Yonghe was calm.

I didn't know where to get a pen and paper, and I looked at the large map on the wall of the headquarters while writing and drawing on the paper.

After smoking a cigarette, Li Xian looked at his brother.

Seeing that the paper was densely filled with words such as;

Τij（ t+1）=ρ·τij（t）+Δτij （t，t+1）…… What∑ i=1 n rikYik≤ck,k=1,2,... , K and other variable formulas that hurt his head when he saw it, Li Xian stuffed the cigarette butt under his feet.

"Seven inches, what are you doing here?"

Liang Yonghe's pen didn't stop, "Count a little thing,"

……

Ding Ling Ling Ling,

The red phone on the desk rang again, and before the secretary could make a move, Zu Qingsheng immediately picked it up.

"Hey, I'm Zu Qingsheng, please speak!"

On the other end of the phone, Feng Xingqiang, political commissar of the military region, said in a solemn tone: "Secretary Zu, I am Feng Xingqiang! Now the situation on the dam is critical, please immediately organize the logistics department to ensure our supply of sand and gravel! The Qingjiang section has just burst the embankment, and there are already many openings on the dam, and now we urgently need sandbags, sandbags, and wooden stakes! Secretary Zu, you must be fast, otherwise a new round of rain will come soon, and I am afraid that this opening will not be stopped!"

There was a mess on the other end of the phone, which made Zu Qingsheng's already messy heart even more irritable.

However, in the face of the comrades on the front line, he could only reassure: "Political Commissar Feng, please hold on a little longer! We have already organized more than 200 vehicles to rush over, and there will be more than 200 in the follow-up, which will be in place immediately! Sandbags, sandbags and wooden stakes, we are also doing our best to deploy them from the surrounding areas, please hold on!"

Feng Xingqiang on the other end of the phone sighed, the situation on the dam was already terrible. Lacking the necessary blockades, the fire and armed police who rushed to the rescue were even using fire axes to chop down trees on the side of the road to plug the gaps in the embankments.

After emphasizing that the current situation is no longer optimistic, he hung up the phone.

Looking at the embankment of the Qingjiang section on the map, which was like a large basin hanging over the head of Jinan City, Zu Qingsheng was silent for a moment.

"Go, invite Comrade Li Xian of the New Taipei Group just now. ”

He silently hung up the phone and said to the secretary next to him.

……

"Secretary Zu, are you looking for me?"

Li Xian looked at Zu Qingsheng, who was standing in front of the map with his hands in his hand, and said softly.

"Oh. Zu Qingsheng came back to his senses and made a gesture of invitation to Li Xian: "Sit." Comrade Li Xian, you just told me that you still have more than 200 cars behind, can you get in touch with them now?"

Li Xian nodded.

The organizational structure of the New Taipei Logistics Branch is relatively special, in order to facilitate the computerized office, the fastest and most direct control of the information of the fleet, and enhance the transportation efficiency, the branch of the fleet is divided into 30-45 vehicles. Each team leader is equipped with a mobile phone on the vehicle to report the fleet information.

Contact, but it can be contacted.

"Great. Zu Qingsheng slapped his face, got up and scratched on the map, and said: "Now the situation in the Qingjiang section is tight, I need you to be in place immediately, along the G204 National Highway, after receiving supplies in Songnan Town, immediately drive to the supply dam of the Qingjiang section!"

"Good. "Li Xian almost understands the current situation. Knowing that the situation was urgent, he immediately picked up the phone in his hand and prepared to call Xie Laoer.

But at this moment, a cadre from the water conservancy department strode in front of Zu Qingsheng and a group of provincial leaders with sweat on his head.

"What's wrong?" Seeing that this person's face was flushed, Ren Guoan on the side immediately asked.

"We received news just now that the Shiyun Reservoir did not hold up...... Already ......"

"What!"

Hearing this news, Zu Qingsheng was stunned, and he immediately found the location of Shiyun Reservoir on the map.

Li Xian looked at his finger and was suddenly shocked in his heart!

Where is the Shiyun Reservoir?

Thirty kilometers northeast of Shiyun County.

Below the reservoir is the Shiyun section of the S204 Provincial Highway!

This lifeline is broken...... The Qingjiang section can be regarded as completely unpreservable.

"Are there any other roads?" Zu Qingsheng fell a little straight gaze on the cadres of the Ministry of Communications on the side.

The latter shook his head.

It's not that he doesn't know, but after the heavy rain, there have been many flash floods and mudslides in various places, and in the current situation of poor communication, no one dares to guarantee that the road that could be walked before can still be passed!

There was silence.

Zu Qingsheng sat down on the chair dejectedly.

Finished.

"We don't have to go down this path. ”

At this moment, Liang Yonghe, who was behind Li Xian, stroked his glasses and said softly.

"Who is this?" The leader of the Ministry of Communications frowned, he knew Li Xian, but obviously didn't notice Liang Yonghe, who had been silent.

"We're all in this together. Li Xian stood beside Liang Yonghe.

The leader nodded, as if to take care of Li Xian's face, and explained: "It's not that there is no other way, it's just that the current situation is here." We don't have time to figure out which sections of the road are working and which ones are not......!

Liang Yonghe ignored what he said next, but directly took a marker and walked to the map on the wall.

Looking at the signs on the map, he glanced at everyone present: "What algorithm is used in the planning of the disaster relief logistics route? Is it just Freud?"

Such a professional problem, the leader must not know.

In the crowd, a young man with glasses raised his hand: "We use the di-JKSTRA marking method and the Freud method. ”

Liang Yonghe nodded, "Same as I guessed." ”

As he spoke, he raised his marker pen and drew a formula directly on the map: "According to the DI notation method and Freud's algorithm, in a limited range, if the optimal path or the shortest distance between any two nodes is required, then the Floyd algorithm can be used to solve it."

There is nothing wrong with this, as these two algorithms are the most commonly used in international disaster relief operations.

However, the current situation is too complicated, and the traditional optimal path selection method mainly selects according to the original path, ignoring the damage caused by floods to the surrounding environment, and the original path cannot be used, resulting in inaccurate path selection.

Especially when we have limited information and don't know the variables between the nodes, the actual efficiency of these two algorithms is quite low!"

When these words came out, the leaders of the audience were collectively stunned - they didn't understand it at all!

Even Li Xian, a scumbag of mathematics, was confused, but vaguely, he knew that Liang Yonghe had an idea.

Sure enough, as he expected, after Liang Yonghe groaned slightly, he directly wrote the formula on the map!

Therefore, I suggested that the Monte Carlo simulation method should be used to establish a simulation model of the correlation between the disaster area and the logistics distribution station. The variable approximation simulation was obtained, and the ant colony algorithm was used to find the optimal path from the starting point to the target point, and the path with pheromone concentration concentration was the optimal path for material logistics and transportation in the disaster area!"

"At present, we have set up the road route between the disaster area and the logistics distribution station area is G= V,A, V= v1,v2,... vn; vA，... VM is the collection of distribution points and material demand points, V1~VN is the distribution point, and the remaining part is the material demand point. A=……”

“……”

Watching Liang Yonghe mark the stronghold on the map with the formula, Zu Qingsheng beckoned to the young man with glasses just now: "What he said...... What does that mean?"

The young man scratched his hair, "Secretary Zu, it seems to be a ...... A method to find the optimal route by using the pheromone change characteristics to change the direction of movement and find the optimal route by using ant foraging biomimetic simulation method......"

Zu Qingsheng still didn't understand, but looking at the numbers of the disaster areas established on the map, the amount of materials required by each disaster area, the lack of materials, and the formula that represented the delay time for finding the path, he nodded deeply.

"Comrade Li Xian, are you reliable?"

Zu Qingsheng set his sights on Li Xian.

Looking at Liang Yonghe, who was still drawing circles on the map, Li Xian smiled: "I believe in him." ”

"That's not right!"

Just as Zu Qingsheng nodded and wanted to explain to the commander and leader on the side, the leader of the traffic department just now suddenly interrupted Liang Yonghe: "Your algorithm is based on the premise of sufficient material supply points, but now that the road is blocked, what is the use of you just finding the path?

Liang Yonghe stopped his pen and looked at Li Xian.

Looking at the smile on Liang Yonghe's face, Li Xian paused lightly.

Although he didn't understand Liang Yonghe's algorithm, he immediately understood what Liang Yonghe was thinking about after being in contact with logistics for so long.

At this moment, there was a sound of footsteps at the entrance of the headquarters.

"Dong Li, we're here! You let us buy the things in the next car in the next car, what are we going to do next?"

Watching Kong Action and the others hula into the headquarters hall under the leadership of the government office staff, Li Xian hooked the corners of his mouth.

"Secretary Zu, we don't necessarily have to use sand and gravel and wooden stakes to block the embankment. We can get the vehicle to resupply nearby, and then drive directly to the dam according to the algorithmic route. Hmmm......"

Looking at Kong Xing and the others who were striding over, Li Xian smiled: "And the material map in our province is in place." ”