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Question: In IntelliJ IDEA, how can I redirect input from resources/p2190A/1.in for the class com.lzw.solutions.codeforces.p2190A.Main, and use a macro/variable so that p2190A becomes easy to change (reusable for other problems)?

Answer:

Here are the most practical & commonly used ways in 2025–2026 among competitive programmers using IntelliJ:

Recommended Solution 1: Run Configuration + $Prompt$ macro (most flexible)

1. Create / edit Run Configuration for your Main class
2. In Program arguments (or VM options — both work), write:

$Prompt$

1. In Working directory, use one of these styles:

   Style A (recommended):

   $MODULE_DIR$/src/main/resources
   

   Style B (if you like problem-code folders):

   $MODULE_DIR$/src/main/resources/$Prompt$
   

2. Every time you run (Shift+F10), IntelliJ will ask you:

   What to input?

   You just type: p2190A → Enter

   → it will read from resources/p2190A/1.in

Recommended Solution 2: Use File Template + Live Template (semi-automatic)

Create a live template (Settings → Editor → Live Templates):

Abbreviation: cf

-Dfile.input=$MODULE_DIR$/src/main/resources/$problemCode$/$fileName$.in

// press Tab to jump between variables

Then in VM options field of run configuration write:

cf

and press Tab → type problem folder name → Tab → type filename (usually 1)

Quick & Dirty Solution 3: Hardcode but with easy replace

VM options:

-Dfile.input=$MODULE_DIR$/src/main/resources/p2190A/1.in

When you want to change problem →
press Ctrl+Shift+R → Replace in File → replace p2190A → very fast

Most Popular Modern Way (2025+) — Solution 4: One run config per contest + folder macro

Many people now do:

Run configuration name: Codeforces Round 952 (Div. 4)

Program arguments:

$Prompt$

Working directory:

$MODULE_DIR$

And in main you do something like:

public static void main(String[] args) throws Exception {
    String folder = args.length > 0 ? args[0] : "p2190A";
    String file   = args.length > 1 ? args[1] : "1";

    System.setIn(new FileInputStream(
        "src/main/resources/" + folder + "/" + file + ".in"
    ));
    // or use Paths.get(...) if you prefer
    ...
}

Then you run → type p2190A → Enter

Very clean and reusable.

Summary – choose one

Method	Flexibility	Typing effort	Recommended for
$Prompt$ in args	★★★★★	low	most people
$Prompt$ in working dir	★★★★	very low	folder structure
Live Template + VM options	★★★★	medium	power users
args[0] = folder name	★★★★★	low	long-term
Just replace string	★★	high	quick & dirty

Most Codeforces/AtCoder users in IntelliJ nowadays use method 1 or method 4.

Good luck & fast AC!

References:

• None required for this answer (IntelliJ macros behavior is standard across recent versions)

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