[Community Puzzle] Shoot Enemy Aircraft

Puzzles
#1

Coding Games and Programming Challenges to Code Better

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Created by @Remi,validated by @FredericLocquet,@Timinator and @McKael.
If you have any issues, feel free to ping them.

#2

hi
could someone explain the rule pls
?

#3

It’s Space invaders.

#4

could you explain the rules
for example task 03
last two dots meaning no plane we should to wait 2 turn -ok
but at the begining of the string we have 4 dots - but only 1 wait. how?!

#5

Hi, I hope this will help you.

Initial state :

...<<<<<<<<<<<<<<<<<<<<<<<..<<<
^______________________________

First turn : you wait

..<<<<<<<<<<<<<<<<<<<<<<<..<<<.
^______________________________

2nd turn : shoot

.<<<<<<<<<<<<<<<<<<<<<<<..<<<..
|______________________________

3rd turn

X<<<<<<<<<<<<<<<<<<<<<<..<<<...
^______________________________
#6

thank you.
so in the description is incorrect ( little bit )
“Each turn your missiles move one cell up.”
as I understand when missile already in air then one cell up for one turn
but launching the missile is occupies 2 turn
[first turn arrow ^ just replacing by |]
[second turn its movies to one cell up]

ok. what is happening with missile when its meet plane ? is it goes to next line (up) ?

#7

That’s why I wrote “Note: When you shoot, the missile appears at the same altitude as the launcher”.
But maybe you can tell me what I can write if it is not clear enough ?

The missile disappears but there is no case where you need the missile to shoot another aircraft (no need to shoot twice at the same turn).

#8

it will be best if launching the missile and fly of missile will be identical (1 turn - 1 line) but might be this is unreal :slight_smile:
then I think is need to describe more detailed this situation with launching and maybe provide some example


#10

That was fun. :slight_smile:

#11

Thank you :slight_smile:

#12

could someone explain to me how planes behave when they exit the screen. Since level 2 is impossible in 1 pass since all 3 planes stack over each other and you cant shoot 3 missiles at once

do they come back from the same side they came or do they turn around


>
 
>. 
> 
< 
<
 
<


#13

Actually this case never appears, you can shoot each plane before it reaches the other side.

#14

Hi, my solution passes all the test cases, but when I submit I fail the “Hold the line case”. I’m not sure how it differs from the corresponding test case, but it seems to be an edge case for my solution and I can’t figure out why.

2 Likes
#15

In the validator the launcher is on the right of the grid (instead of the left in the test case).
You can try this custom test case :

2
>.>..
____^

Output : SHOOT WAIT SHOOT

3 Likes
#16

Thanks, it seems the problem occurs when the gun is in the rightmost position.

#17

Hi,

Your puzzle seems cool but I have an issue to print the value “WAIT” (it works with “SHOOT”).
I tried with different languages (Dart and after Javascript) and I have the same issue.

For example with this code (it’s the default one with the line console.log('SHOOT') commented) :

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/

const n = parseInt(readline());
for (let i = 0; i < n; i++) {
    const line = readline();
}

// Write an answer using console.log()
// To debug: console.error('Debug messages...');

//console.log('SHOOT');
console.log('WAIT');

I have the result "Failed. Found: nothing, Expected: “WAIT” ".

Do you have any idea of the problem ? Thanks !

#18

Hi, you have to output several lines, until you shoot every aircraft. Your first line is WAIT but your 2nd line is nothing because you don’t output a second line.

#19

Hello,

I have a little problem with my PHP output, everything is fine, I get the correct firing instructions, but there is a formatting error.

Sortie console
Sortie standard :

array (
  0 => '....................',
  1 => '.>..................',
  2 => '...................<',
  3 => '....................',
  4 => '....................',
  5 => '_________^__________',
)
WAIT
WAIT
WAIT
SHOOT
WAIT
WAIT
SHOOT

Échec
Trouvé :

SHOOTEnd of line (\n)

Attendu :

Rien

I use the proposed output function:

    {
        echo("SHOOT\n");
    } else {
        echo("WAIT\n");
    }

Thanks for your help :wink:

#20

Maybe you printed an unexpected ‘\n’ (empty line after the last SHOOT)

#21

Thanks, it was simply that :wink: