means B saw someone with a black hat, while, B sees that everyone except himself is the same, that is, all wearing white hats. A thinks: B must have seen himself wearing black hats. Similarly, B will think like this, so when the lights are turned off for the second time, AB will beat itself ,..., In this case, N people wear black hats if a slap in the face appears after the light is turned off n times.
For question 4, see: http://www.oursci.org/archive/magazine/200111/011111.htm
【Optimization]
Yu Minhong's four bottles of water
There is a bottle of water in front of us because it is a good thing and everyone wants it. In order to get this bottle of water, I ran forward, and someone else took the water before I was about to catch it. But I still want to move forward, and there is a basket of flowers waiting for me. Of course, when I walked to the front of the flowers, it may have been taken away a
: Notice that the splice () method works differently than the slice () method, and the splice () method modifies the array directly.Example removes 0 elements from the 2nd bit, inserting "drum"var myFish = ["Angel", "Clown", "Mandarin", "Surgeon"//var removed = Myfish.splice (2, 0, "drum"// // deleted element array: [], no element deletedDelete 1 elements starting from 3rd bitvar myFish = [' Angel ', ' clown ', ' drum ', ' Mandarin ', ' sturgeon ']; var removed = Myfish.splice (3, 1); // myfish:
Ing is a very simple and practical mathematical technique that can often achieve clear results.
Ing to integers is frequently used.
Simple ing of discrete values is relatively trivial. If the ing can be combined with sequences, it can be very extraordinary.
For example, I have recently asked a question: 1000 bottles of water, one of which is toxic. When a white mouse dies after drinking for a week, how many white mice can find the bottle of water with
problem: one bottle contains one bacteria. bacteria are split once a minute, 1 change 2 , 60 the bottle will be full in minutes. How long will it take to fill the bottle with two bacteria?
first, we use a guess, not 30 59 , it cannot be other answers. If you want me to 30 and 59 select an answer, I will definitely choose 59 , impossib
When we open bottles and jars, we often encounter the embarrassment of finding the right tool because of different bottle sizes. So sometimes in order to open a bottle, home to prepare a variety of bottle opener. Also open a bottle, why so troublesome? So someone invented the multifunctional
8 bottle of wine a bottle of poisonous, employing test. 8 hours after each test result, and you only have 8 hours of time. Ask for at least (B) people to test.
A, 2 B, 3 C, 4 D, 6
Resolution: Use 3-bit 2 to represent 8 bottles of wine, as shown in the table below
Bottle serial number binary poisoning case
The first bottle
/*** A total of 1000 bottles of soda, did not finish a bottle to get an empty bottle, every 3 empty bottles can change 1 bottles of soda, drink and then get an empty bottle, ask how many bottles of soda, and finally how many empty bottles*/ Public Static voiddrink () {intnum = $, empty = 0, total = 0; while(num > 0) {num--;//drink a
DescriptionJyy has been thinking of returning to Earth as soon as possible, but his ship's fuel is not enough.One day he went to the Martians to fuel, this time the Martians promised to jyy with the ship's bottles to change. JyyOn the ship there are N bottles (1After handing K bottles to the Martians, the Martians used them to put some fuel into the jyy. All the bottles have no scale, onlyThe volume is marked at the bottle, and the volume of the I
functionality that your users need, instead of doing a bunch of useless things to users, identify and optimize usability issues as early as possible before product development, such as the prototype design phase, and reduce the risk of failure due to not understanding the requirements properly; Minimizing or eliminating documents can also reduce expenses.
Ii. 4 Dimensions of usability assessment
Functional functionality: Whether the product is useful. For example,
Description
Background
"KO-RE-A, KO-RE-A" Shout 54.000 happy football fans after their team has reached the semifinals of the FIFA World Cup in their home country. but although their excitement is real, the Korean people are still very organized by nature. for example, they have organized huge trumpets (that sound like blowing a ship's horn) to support their team playing on the field. the fans want to keep the level of noise constant throughout the match.
The trumpets are operated by compressed
This pure violence will timeout, simply push the recursive formula can be, in fact, is a Fibonacci sequence.World Cup Noise
Time Limit: 1000MS
Memory Limit: 30000K
Total Submissions: 15937
Accepted: 7861
DescriptionBackground"Ko-re-a, ko-re-a" Shout 54.000 happy football fans after their team have reached the semifinals of the FIFA World Cup in T Heir home country. But although their excitement is real, the Korean people was still v
of bottle movements. You shoshould also print the minimum number of bottle movements.
The output shoshould consist of a string of the three upper case characters 'G', 'B', 'C' (representing the colors green, brown, and clear) representing the color associated with each bin.
The first character of the string represents the color associated with the first bin, the second character of the string represents th
DescriptionJyy has been thinking of returning to Earth as soon as possible, but his ship's fuel is not enough. one day he went to the Martians to fuel, this time the Martians promised to jyy with the ship's bottles to change. Jyyon the ship there are N bottles (1after handing K bottles to the Martians, the Martians used them to put some fuel into the jyy. All the bottles have no scale, onlyThe volume is marked at the bottle, and the volume of the I
Time Limit: 3.000 secondsTime Limit: 3.000 seconds
Background
Background
Bin packing, or the placement of objects of certain weights into different bins subject to certain constraints, is an historically interesting problem. some bin packing problems are NP-complete but are amenable to dynamic programming solutions or to approximately optimal heuristic solutions.The packing problem is that how to put objects of different weights into different boxes under certain constraints is an interes
had n buckets in front of us, one in each bucket, and now the numbers are out of order, we don't move the buckets, we sort the numbers out. we numbered n buckets from left to right, respectively, from 0 to N-1 .ok!!! Please follow my steps Oh ~ Don't fall behind!! 1 Take the number of bucket No. 0 in your hand, and this number, we'll use it as the base number, mid .2 Take a name called the high water bottle as a marker, from the right n-1 bucket to t
this year I met in the written interview of three companies including 360, summed up the question of two methods and ingenious solutions, to facilitate the recruitment or when an intellectual problem to start thinking. Ask one: Three empty bottles for a bottle of soda, a class bought 30 bottles of soda, to ensure that each person drink a bottle of soda, up to how many students? Ask two: Three empty bottles
Last night at the 9-point cf,div2, in order to rating change opened the trumpet.
Speaking of the last one is also DIV2 the trumpet to attend, and then the first trumpet on the 1900, last night after playing the second trumpet also on the DIV1. Very happy.
The last time at home is probably not in the 12:30 cf. After all
In C ++, we can also integrate functions with the same function into a function without having to write many functions with different function names. This is called function overloading. The following is a detailed analysis of function overloading in C ++. For more information, see
When we open a bottle or tank, we often encounter the embarrassment that we cannot find the proper tool because of the different bottl
a new way to sit in the face of changing directions)
13. There is a bottle containing salt with a volume of W. After the salt is used up, some salt powder (volume can be ignored) remains on the bottle wall. Now I want to modify the sugar in the bottle and give you u-volume purified water to clean the bottle. After eac
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