Day 17

Author: Lank891

Day 17 - JS/README.md

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+# [Day 17](https://adventofcode.com/2021/day/17) in [JavaScript (node)](https://nodejs.org/en/)
+
+### Additional input information that must be provided in the code
+* Bounds of simulation (yeah it is a bruteforce)

Day 17 - JS/input.txt

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+target area: x=139..187, y=-148..-89

Day 17 - JS/solution.js

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+fs = require('fs');
+
+const file = fs.readFileSync('./input.txt', 'utf-8');
+const minSimX = 0
+const maxSimX = 5000
+const minSimY = -5000
+const maxSimY = 5000
+
+const inputInformationRegex = /^.*x=(-?\d+)\.\.(-?\d+).*y=(-?\d+)\.\.(-?\d+)\s*$/i
+const inputVals = file.match(inputInformationRegex)
+const minX = parseInt(inputVals[1])
+const maxX = parseInt(inputVals[2])
+const minY = parseInt(inputVals[3])
+const maxY = parseInt(inputVals[4])
+
+function simulateForStart(sX, sY) {
+    let actualMaxY = 0
+    let wasHit = false
+
+    let x = 0
+    let y = 0
+    //console.log(sX, sY)
+    while(!(wasHit || (sY < 0 && y < minY))) {
+        x += sX
+        y += sY
+        //console.log(x, y)
+        //console.log(sX, sY)
+        if(y > actualMaxY) {
+            actualMaxY = y
+        }
+        sY -= 1
+        sX -= Math.sign(sX)
+        //console.log(x, minX, maxX, y, minY, maxY)
+        if(x >= minX && x <= maxX && y >= minY && y <= maxY) {
+            //console.log(x, y)
+            wasHit = true
+        }
+    }
+    //console.log(wasHit)
+    return {maxY: actualMaxY, hit: wasHit}
+}
+
+let foundYs = []
+
+for(let sY = minSimY; sY <= maxSimY; sY++) {
+    for(let sX = minSimX; sX <= maxSimX; sX++) {
+        const res = simulateForStart(sX, sY)
+        if(res.hit) {
+            foundYs.push(res.maxY)
+        }
+    }
+}
+
+console.log("Part 1:", Math.max(...foundYs))
+console.log("Part 2:", foundYs.length)

README.md

@@ -2,11 +2,11 @@
 Done in variety of languages
 
 ### Progress
-![](https://img.shields.io/badge/days%20completed%20📅-16-blue)
+![](https://img.shields.io/badge/days%20completed%20📅-17-blue)
 
-![](https://img.shields.io/badge/stars%20⭐-32-yellow)
+![](https://img.shields.io/badge/stars%20⭐-34-yellow)
 
-![](https://img.shields.io/badge/languages%20💬-14-red)
+![](https://img.shields.io/badge/languages%20💬-15-red)
 
 ### Notes
 * In all programs input file must be provided in the source code (usually somewhere at the top)
@@ -19,7 +19,7 @@ Done in variety of languages
 |1|Python||14|Go|
 |2|C# (.NET Core 6.0)||15|Scala|
 |3|C++||16|Scala|
-|4|TypeScript||17||
+|4|TypeScript||17|JavaScript|
 |5|Kotlin||18||
 |6|Haskell||19||
 |7|R||20||