Add '2020/' from commit 'aaabfa90c9033044d0a9d5fe6776b718711ef46c'

git-subtree-dir: 2020
git-subtree-mainline: ab8f135946
git-subtree-split: aaabfa90c9

2020/01/input

@@ -0,0 +1,200 @@
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2020/01/part1.js

@@ -0,0 +1,24 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+let numbers = [];
+
+readInterface.on('line', function(line) {
+  numbers.push(Number(line));
+});
+
+readInterface.on('close', function(line) {
+  numbers.forEach(function(a) {
+    numbers.forEach(function(b) {
+      if (a + b == 2020) {
+        console.log(a*b);
+        process.exit();
+      }
+    });
+  });
+});

2020/01/part2.js

@@ -0,0 +1,26 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+let numbers = [];
+
+readInterface.on('line', function(line) {
+  numbers.push(Number(line));
+});
+
+readInterface.on('close', function(line) {
+  numbers.forEach(function(a) {
+    numbers.forEach(function(b) {
+      numbers.forEach(function(c) {
+        if (a + b + c == 2020) {
+          console.log(a*b*c);
+          process.exit();
+        }
+      });
+    });
+  });
+});

2020/02/part1.js

@@ -0,0 +1,33 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+let re = /^(\d+)-(\d+) (\w+): (\w+)$/i
+let valid = 0;
+
+readInterface.on('line', function(line) {
+  let result = re.exec(line);
+  if (result == null) {
+    return;
+  }
+
+  let min = Number(result[1]);
+  let max = Number(result[2]);
+  let match = result[3];
+  let pass = result[4];
+
+  let count = 0;
+  pass.split('').forEach(x => x == match ? count++ : null);
+
+  if (count >= min && count <= max) {
+    valid++;
+  };
+});
+
+readInterface.on('close', function(line) {
+  console.log(valid);
+});

2020/02/part2.js

@@ -0,0 +1,30 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+let re = /^(\d+)-(\d+) (\w+): (\w+)$/i
+let valid = 0;
+
+readInterface.on('line', function(line) {
+  let result = re.exec(line);
+  if (result == null) {
+    return;
+  }
+
+  let pos1 = Number(result[1]) - 1;
+  let pos2 = Number(result[2]) - 1;
+  let match = result[3];
+  let pass = result[4];
+
+  if ((pass[pos1] == match && pass[pos2] != match) || (pass[pos1] != match && pass[pos2] == match)) {
+    valid++;
+  };
+});
+
+readInterface.on('close', function(line) {
+  console.log(valid);
+});

2020/03/input

@@ -0,0 +1,323 @@
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+...........##.#...#.#..........
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+.........#.#.#.#...........#.#.
+....#.#..##......#.#.#..##.....
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+..##..#..#...#...##........##..
+..#.##....#..#......###..#.....

2020/03/part1.js

@@ -0,0 +1,52 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+
+// array of arrays of bool. Coordinates are [y][x]. True = tree.
+let map = [];
+
+readInterface.on('line', function(line) {
+  let row = [];
+  
+  line.split('').forEach(function(char) {
+    if (char == '.') {
+      row.push(false);
+    } else if (char == '#') {
+      row.push(true);
+    }; // ignore any other character
+  });
+  
+  console.log(line);
+  console.log(row);
+
+  map.push(row);
+});
+
+readInterface.on('close', function(line) {
+  let treesHit = 0;
+  let x = 0;
+  let y = 0;
+
+  while (y + 1 < map.length) {
+    x += 3;
+    y += 1;
+
+    if (x + 1 > map[y].length) {
+      x -= map[y].length;
+    }
+
+    if (map[y][x]) {
+      treesHit++;
+    }
+
+    console.log(x, y, map[y][x]);
+  }
+
+  console.log(treesHit);
+});
+

2020/03/part2.js

@@ -0,0 +1,57 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+
+// array of arrays of bool. Coordinates are [y][x]. True = tree.
+let map = [];
+
+readInterface.on('line', function(line) {
+  let row = [];
+  
+  line.split('').forEach(function(char) {
+    if (char == '.') {
+      row.push(false);
+    } else if (char == '#') {
+      row.push(true);
+    }; // ignore any other character
+  });
+
+  map.push(row);
+});
+
+
+readInterface.on('close', function(line) {
+  let totals = [];
+
+  [[1,1], [3,1], [5,1], [7,1], [1,2]].forEach(function(step) {
+
+    let treesHit = 0;
+    let x = 0;
+    let y = 0;
+
+    while (y + 1 < map.length) {
+      x += step[0];
+      y += step[1];
+
+      if (x + 1 > map[y].length) {
+        x -= map[y].length;
+      }
+
+      if (map[y][x]) {
+        treesHit++;
+      }
+
+//      console.log(x, y, map[y][x]);
+    }
+
+    totals.push(treesHit);
+  }); 
+
+  console.log(totals.reduce((a,b) => a * b));
+});
+

2020/04/part1.js

@@ -0,0 +1,53 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+
+let passports = [];
+let cPass = {};
+
+readInterface.on('line', function(line) {
+  if (line.length == 0) {
+    passports.push(cPass);
+    cPass = {};
+    return;
+  }
+
+  line.split(' ').forEach(function(kv) {
+    parts = kv.split(':');
+    cPass[parts[0]] = parts[1];
+  });
+
+//  console.log(cPass);
+});
+
+let required = new Set(['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid' ]);
+let optional = new Set([ 'cid' ]);
+
+readInterface.on('close', function(line) {
+  // Save the last passport if it has any fields
+  if (Object.keys(cPass).length > 0) {
+    passports.push(cPass);
+  }
+
+  let count = 0;
+  passports.forEach(function(passport) {
+    let keys = new Set(Object.keys(passport));
+    let missing = new Set([...required].filter(x => !keys.has(x)))
+
+    console.log(passport);
+    console.log(missing);
+    console.log("");
+
+    if (missing.size == 0) {
+      count++;
+    }
+  });
+  
+  console.log(count);
+});
+

2020/04/part2.js

@@ -0,0 +1,99 @@
+const fs = require('fs')
+const readline = require('readline');
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream('input'),
+    console: false
+});
+
+
+let passports = [];
+let cPass = {};
+
+readInterface.on('line', function(line) {
+  if (line.length == 0) {
+    passports.push(cPass);
+    cPass = {};
+    return;
+  }
+
+  line.split(' ').forEach(function(kv) {
+    parts = kv.split(':');
+    cPass[parts[0]] = parts[1];
+  });
+
+//  console.log(cPass);
+});
+
+let required = new Set(['byr', 'iyr', 'eyr', 'hgt', 'hcl', 'ecl', 'pid' ]);
+let optional = new Set([ 'cid' ]);
+
+function validKeys(passport) {
+  let keys = new Set(Object.keys(passport));
+  let missing = new Set([...required].filter(x => !keys.has(x)))
+
+  return missing.size == 0;
+}
+
+function validBYR(passport) {
+  let byr = Number(passport['byr']);
+
+  return byr >= 1920 && byr <= 2002;
+}
+
+function validIYR(passport) {
+  let iyr = Number(passport['iyr']);
+
+  return iyr >= 2010 && iyr <= 2020;
+}
+
+function validEYR(passport) {
+  let eyr = Number(passport['eyr']);
+
+  return eyr >= 2020 && eyr <= 2030;
+}
+
+function validHGT(passport) {
+  if (!passport.hasOwnProperty('hgt')) {
+    return false;
+  }
+
+  let hgt = parseInt(passport['hgt']);
+
+  if (passport['hgt'].endsWith('cm')) {
+    return hgt >= 150 && hgt <= 193;
+  }
+
+  // inches
+  return hgt >= 59 && hgt <= 76;
+}
+
+const validHCLs = /^#[a-f0-9]{6}$/;
+function validHCL(passport) {
+  return validHCLs.test(passport['hcl']);
+}
+
+const validECLs = new Set(['amb', 'blu', 'brn', 'gry', 'grn', 'hzl', 'oth']);
+function validECL(passport) {
+  return validECLs.has(passport['ecl']);
+}
+
+const validPIDs = /^[0-9]{9}$/
+function validPID(passport) {
+  return validPIDs.test(passport['pid']);
+}
+
+function valid(p) {
+  return (validKeys(p) && validBYR(p) && validIYR(p) && validEYR(p) && validHGT(p) && validHCL(p) && validECL(p) && validPID(p));
+}
+
+readInterface.on('close', function(line) {
+  // Save the last passport if it has any fields
+  if (Object.keys(cPass).length > 0) {
+    passports.push(cPass);
+  }
+
+  let count = passports.filter(valid).length;
+  console.log(count);
+});
+

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@@ -0,0 +1,782 @@
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