THE SNAIL IN THE WELL

Question

Hello everyone, I am completing the javascript course, however in the second module they pose the following problem, which I have been trying to solve since yesterday, if someone could guide me I would appreciate it very much.
Pd: I do not speak English, I am using a translator due to the demand of American users

The snail climbs 7 feet each day and retreats 2 feet each night.
How many days will it take for the snail to get out of a well with the given depth?
Input example: 31
Output example: 6
Explanation: Let's break down the distance that the snail covers each day:
Day 1: 7-2 = 5
Day 2: 5 + 7-2 = 10
Day 3: 10 + 7-2 = 15
Day 4: 15 + 7-2 = 20
Day 5: 20 + 7-2 = 25
Day 6: 25 + 7-32
So, on day 6 the snail will reach 32 feet and come out of the well during the day, without slipping again that night.

Answer 1

if((31-(31%(7-2))+2)>31){
console.log(Math.floor(31/(7-2)))
}
else {
console.log(Math.floor(31/(7-2))+1)
}

should work fine .

If it did and you need an explanation of what I did I would add that as well .

Answer 2

You can try it in this way also

function main() {
var depth = parseInt(readLine(), 10);
//your code goes here
var day = 0;
var total = 0;
while(total<depth){
day = day + 1;
total = total + 7;
if(total >= depth){
console.log(day);
break;
}
total = total - 2;
}
}

Answer 3

Belkin !! Wasn't 6 the answer?

I just gave an idea or say a solution for the problem not full code for it ,replace those values with input variables.

Answer 4

Abhay Oh I get it, thank you very much, hey, one last thing would be too much to ask you to explain the example you gave me, please

Answer 5

Belkin !! Since snail is climbing only 5(7-2) feet in a full day ,you can simply divide the depth of well by 5 feet and you would know how many full days it took the snail to come out of well or is close to it like 31/5= 6 days .( If you round it off to a value lower than actual value(6.2)),

Now to confirm that 6 days is enough or not What I did was to get the remainder of depth left after climbing for a full day and subtract that remainder from actual well depth to get actual depth that snail was able to climb i.e. 31-31%5=30,

Now I added the height from the last day night since the snail didn't retreated that night and so it was snail climbing 5+5+5+5+5+7 i.e.30+2=32 ,

And now we know that snail was able to climb 32 feet after 6 days but to confirm it, we check if 32 was greater than actual well depth well to see if it climbed fully ,if not we will add 1 day more to it like what I did .

Hopefully you get it ,if not let me know what you didn't understood specifically in my answer .

Answer 6

The result always gives 6, it does not work, thank you very much brother

Answer 7

Belkin !! I will do that tomorrow ,now it's time for me to sleep .

Answer 8

Abhay Give him brother, no problems, thank you very much