how many weighting will you do?

-
I found this question from past yrs paper of one of my subject. Well, it from algorithm analysis and i found this question interesting. somehow it like a iq question.

here it goes:

+++++

You have 70 coins that are all supposed to be gold coins of the same weight, but you know that one coin is fake and weights less than the others. you have a balance scale; you can put any number of coins on each side of the scale at one time, and it will tell you if the 2 sides weight the same, or which side is lighter if they do not weigth the same.

Outline an algorithm for finding the fake coin. *ignore this part*

how many weighting will you do?

+++++

Comments

Post a Comment

Popular posts from this blog

Another trip in process. [edited]

-
This following detail are all depart from 17th,18th dec and return at 23th or 24th dec Macau RM 392.98 Bali RM 302.98 Bangkok RM 282.98 Phuket RM 202.98 Hat Yai RM 182.98 Kota Kinabalu RM 119.98 Kuching RM 99.98 Langkawi RM 79.98 ** it's a return ticket. **Include everything [tax & fuel surchange]. BUT NOT THAILAND AND INDONESIA. **For any thailand airport, it charge THB 500 [RM 45.8046], just add this THB500 into those thailand destination. **For any Indonesia airport, it charge RB 100 000 [RM 37.5931], just add this RB 100 000 into those Indonedia destination. ** YOU HAD TO ACT FAST TO GRAB THIS TICKET.
Read more

Ethos, pathos, and logos

-
Ethos, pathos, and logos are super useful tools, especially if you want to get better at persuasion, writing, or even just understanding how people make arguments. Here’s a simple breakdown: Ethos = Credibility It's about convincing your audience that you are trustworthy or an authority. Example: “I've been a dentist for 20 years — trust me when I say this toothpaste works.” Pathos = Emotion It's about stirring your audience's feelings — fear, joy, anger, sadness — to persuade them. Example: “Imagine the pain your child feels with every cavity because you didn't choose the right toothpaste.” Logos = Logic and Reason It's about using facts, data, or logical arguments. Example: “Clinical studies show that this toothpaste reduces cavities by 60% within six months.” Together, they’re like a full toolkit: Ethos makes people trust you. Pathos makes people feel something. Logos makes people think logically.
Read more

small effort, big satisfaction

-
Image
What is the best solution for extremely HOT weather *last week*. Tong Sui, of course. So, we went shopping around and decided Loh Hon Goh [罗汉果] and Fan Shu Tong Sui [ 蕃薯糖水] will be real ez to cook. Indeed. Its THAT simple and ez. +++++++ Loh Hon Goh [L.H.G] 罗汉果 1. Of course, a bowl. 2. Loh Hon Goh, 罗汉果 . Because only 2 of us, so we only need one L.H.G. We bought 2, only cost us like rm1++. 3. A pack of Mi Jao，蜜枣. Cost us like rm2+. 4. A pack of dry Longan. RM2.50. * you can have 海底椰 and 雪耳 too* 5. Tear off the 罗汉果. 6. Put everything inside the bowl. one teared apart 罗汉果, half pack of longan, 10 pieces of 蜜枣. and also the last and the most important element-- water. 7. Boil it for an hour. *my kichten is kinda dirty, i know it well* 8. WAH LAH. there u go. **** by default, no need to add in any sugar as the 蜜枣 are sweet enuf. but u can always control the sweetness by added water and sugar. +++++++++++++++++ 蕃薯糖水 1. Cut all the sweet potato into pieces. Cut those purple and orange into b...
Read more