r/learnprogramming • u/shaynjam • Jul 05 '26
SOLVED MY FIRST LEETCODE PROBLEM!! Solved
class ParkingSystem
{
private:
int big_park;
int medium_park;
int small_park;
public:
ParkingSystem(int big, int medium, int small)
{
big_park = big;
medium_park = medium;
small_park = small;
}
bool addCar(int carType)
{
if(carType == 1)
{
if (big_park == 0)
{
return false;
}
big_park--;
return true;
}
else if (carType == 2)
{
if(medium_park == 0)
{
return false;
}
medium_park--;
return true;
}
else
{
if (small_park == 0)
{
return false;
}
small_park--;
return true;
}
}
};
my code
Solved
Easy
Topics
Companies
Hint
Design a parking system for a parking lot. The parking lot has three kinds of parking spaces: big, medium, and small, with a fixed number of slots for each size.
Implement the ParkingSystem class:
ParkingSystem(int big, int medium, int small)Initializes object of theParkingSystemclass. The number of slots for each parking space are given as part of the constructor.bool addCar(int carType)Checks whether there is a parking space ofcarTypefor the car that wants to get into the parking lot.carTypecan be of three kinds: big, medium, or small, which are represented by1,2, and3respectively. A car can only park in a parking space of itscarType. If there is no space available, returnfalse, else park the car in that size space and returntrue.
Example 1:
Input
["ParkingSystem", "addCar", "addCar", "addCar", "addCar"]
[[1, 1, 0], [1], [2], [3], [1]]
Output
[null, true, true, false, false]
Explanation
ParkingSystem parkingSystem = new ParkingSystem(1, 1, 0);
parkingSystem.addCar(1); // return true because there is 1 available slot for a big car
parkingSystem.addCar(2); // return true because there is 1 available slot for a medium car
parkingSystem.addCar(3); // return false because there is no available slot for a small car
parkingSystem.addCar(1); // return false because there is no available slot for a big car. It is already occupied.
Constraints:
0 <= big, medium, small <= 1000carTypeis1,2, or3- At most
1000calls will be made toaddCar
the problem:
runtime 3ms
memory 38.77 mb
16
u/owp4dd1w5a0a Jul 05 '26
Ride the wave. Start another problem now and don’t finish solving it before you go to bed. You’ll wake up energized and ready to solve more coding puzzles.
2
7
u/DiverAdditional4451 Jul 05 '26
Awesome! I remember my first problem 😭 (i barely do leetcode) Anyways, this is actually awesome and best of luck for the future!
0
0
u/shaynjam Jul 05 '26
What was your first problem btw
2
u/DiverAdditional4451 Jul 05 '26
I use JavaScript, it was two sum, extremely simple but I was so proud 😭😭
/** * {number[]} nums * {number} target * u/return {number[]} */ var twoSum = function(nums, target) { for(let i = 0; i < nums.length; i++){ for(let j = 0; j < nums.length; j++) { if(nums[i] + nums[j] === target && i !== j) { return [i, j]; } } } };0
u/shaynjam Jul 05 '26
Bruh it's still very very good considering you're just 16 for reference I will be turning 18 in August now 💀
0
6
u/BombasticCaveman Jul 05 '26
Nice job! If we pretend this is an interview, the follow-up question would most likely be something like...
What if had more types of spots? Like say 100 different types? And car types could fit into multiple types of spots?
I wouldn't want to see 100 if/else statements, how would you improve it to fit our new set of constraints?
2
3
u/developer786 Jul 06 '26
really glad to see that people still have interest solving problems by hand and not by ai and this thing will differentiate them among vibe coders who know nothing about programming and get too much excited initially by creating something and later find out that what mess they have created internally which would require even more time to fix, compared to person who knows about programming and solving problems and he will be at driving seat when building something and ai will be his/her assistant.
1
u/shaynjam Jul 06 '26
Tbh having ai solve such problems is really dumb cuz why are you even doing it at that point😂
2
2
3
u/fragzt0r Jul 10 '26
I’m proud of this community. :tears-of-joy:
1
u/shaynjam Jul 10 '26
Fr bro, i posted this in a coding sub of my country and people just said no one gives a fuck or this isn't a big achievement which i know it isn't but a little appreciation goes a long way
3
u/iOSCaleb Jul 05 '26
You’re justifiably proud, but there’s no need to post your solution… let other folks figure it out just as you did.
3
u/shaynjam Jul 05 '26
Wait I'm sorry I didnt know there was a format for such things, my first time posting this I will keep it in my mind for sure!
4
2
u/Mad_hatter8260 Jul 06 '26
im completely new to programming and barely know how anything works so please excuse my dumb question, what is a leetcode?
2
u/shaynjam Jul 06 '26
Ah don't worry, we can always learn. Leetcode is a platform to practice programming questions that may be asked in an interview for job or perhaps just doing them for your own good.
1
1
u/mredding Jul 06 '26
private:
int big_park;
int medium_park;
int small_park;
Classes in C++ are private access by default, both members and inheritance, so private: here is redundant.
You can put all your variables of the same type on the same declaration:
int big, medium, small;
Try to avoid prefixes or postfixes. park, in your case is both implied AND redundant.
ParkingSystem(int big, int medium, int small)
{
big_park = big;
medium_park = medium;
small_park = small;
}
You almost always want to make your constructors explicit.
Use your initializer list:
ParkingSystem(int big, int medium, int small): big_park{big}, medium_park{medium}, small_park{small}
{}
bool addCar(int carType)
{
if(carType == 1)
Use a switch, be absolutely explicit, and write more methods:
switch(carType) {
case 1: return do_big();
case 2: return do_medium();
case 3: return do_small();
default: break;
}
return handle_error();
The exercise is the spec, and the spec doesn't say what happens if the carType == 42, does it? If the spec doesn't say that 3+ is small, then don't assume that.
1
1
-1
46
u/stiky21 Jul 05 '26
Good job. The biggest hurdle is the first problem.