Day 2

Day 02/Part 1/index.ts

@@ -0,0 +1,45 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    let count = 0;
+    data.split('\n').forEach(line => {
+      let safe = true;
+      let positive = undefined;
+
+      const spLine = line.split(' ');
+      if (!spLine[0] || !spLine[1]) throw new Error()
+      for(let i = 0; i<spLine.length-1;i++){
+        if(!spLine[i] || !spLine[i+1]) throw new Error();
+        if (!safe) continue;
+        let i1 = parseInt((spLine[i]??"0"))
+        let i2 = parseInt((spLine[i+1]??"0"))
+        console.log(`i1: ${i1} | i2: ${i2} | diff: ${i1-i2} | safe: ${safe}`)
+        if(i1-i2>3 || i2-i1>3 || i2-i1 == 0) {
+          safe = false;
+          continue;
+        }
+        if(i1-i2 > 0) {
+          if(!positive && positive !== undefined){
+            safe = false;
+            continue;
+          }
+          positive = true;
+        }
+        if(i1-i2 < 0) {
+          if(positive){
+            safe = false;
+            continue;
+          }
+          positive = false;
+        }
+      }
+      if(safe) count++
+      console.log(`---- safe=${count} ----`)
+    })
+
+
+    console.log(count)
+  })
+}

Day 02/Part 2/index.ts

@@ -0,0 +1,62 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    let count = 0;
+    data.split('\n').forEach(line => {
+      const spLine = line.split(' ');
+
+      let safe = checkIsSafe(spLine)
+      if(safe) count++
+      if(!safe){
+        let safeMinusOne = false;
+        for(let j = 0; j<spLine.length; j++){
+          if(safeMinusOne) continue;
+          console.log(`-- unsafe - checking without value #${j} --`)
+          let spLineF = spLine;
+          spLineF = spLineF.filter((_value, index) => index !== j);
+          safeMinusOne = checkIsSafe(spLineF)
+        }
+        if(safeMinusOne) {
+          safe = safeMinusOne
+          count++
+        }
+      }
+      if (safe) console.log(`---- safe=${count} ----`)
+      if (!safe) console.log("---- unsafe, even filtered ----")
+    })
+
+
+    console.log(count)
+  })
+}
+
+function checkIsSafe(spLine:string[]){
+  let safe = true;
+  let positive = undefined;
+  if (!spLine[0] || !spLine[1]) throw new Error()
+  for(let i = 0; i<spLine.length-1;i++){
+    if (!safe) continue;
+    if(!spLine[i] || !spLine[i+1]) throw new Error();
+    let i1 = parseInt((spLine[i]??"0"))
+    let i2 = parseInt((spLine[i+1]??"0"))
+    if(i1-i2>3 || i2-i1>3 || i2-i1 == 0) {
+      safe = false;
+    }
+    if(i1-i2 > 0) {
+      if(!positive && positive !== undefined){
+        safe = false;
+      }
+      positive = true;
+    }
+    if(i1-i2 < 0) {
+      if(positive){
+        safe = false;
+      }
+      positive = false;
+    }
+    console.log(`i1: ${i1} | i2: ${i2} | diff: ${i1-i2} | safe: ${safe} | positive: ${positive}`)
+  }
+  return safe;
+}