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Day 21

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Tim Stallard 2016-12-21 14:48:43 +00:00
parent 033bad07ca
commit 62a76e6fba
3 changed files with 164 additions and 0 deletions
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100
day21/input.txt Normal file
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move position 0 to position 3
rotate right 0 steps
rotate right 1 step
move position 1 to position 5
swap letter h with letter b
reverse positions 1 through 3
swap letter a with letter g
swap letter b with letter h
rotate based on position of letter c
swap letter d with letter c
rotate based on position of letter c
swap position 6 with position 5
rotate right 7 steps
swap letter b with letter h
move position 4 to position 3
swap position 1 with position 0
swap position 7 with position 5
move position 7 to position 1
swap letter c with letter a
move position 7 to position 5
rotate right 4 steps
swap position 0 with position 5
move position 3 to position 1
swap letter c with letter h
rotate based on position of letter d
reverse positions 0 through 2
rotate based on position of letter g
move position 6 to position 7
move position 2 to position 5
swap position 1 with position 0
swap letter f with letter c
rotate right 1 step
reverse positions 2 through 4
rotate left 1 step
rotate based on position of letter h
rotate right 1 step
rotate right 5 steps
swap position 6 with position 3
move position 0 to position 5
swap letter g with letter f
reverse positions 2 through 7
reverse positions 4 through 6
swap position 4 with position 1
move position 2 to position 1
move position 3 to position 1
swap letter b with letter a
rotate based on position of letter b
reverse positions 3 through 5
move position 0 to position 2
rotate based on position of letter b
reverse positions 4 through 5
rotate based on position of letter g
reverse positions 0 through 5
swap letter h with letter c
reverse positions 2 through 5
swap position 7 with position 5
swap letter g with letter d
swap letter d with letter e
move position 1 to position 2
move position 3 to position 2
swap letter d with letter g
swap position 3 with position 7
swap letter b with letter f
rotate right 3 steps
move position 5 to position 3
move position 1 to position 2
rotate based on position of letter b
rotate based on position of letter c
reverse positions 2 through 3
move position 2 to position 3
rotate right 1 step
move position 7 to position 0
rotate right 3 steps
move position 6 to position 3
rotate based on position of letter e
swap letter c with letter b
swap letter f with letter d
swap position 2 with position 5
swap letter f with letter g
rotate based on position of letter a
reverse positions 3 through 4
rotate left 7 steps
rotate left 6 steps
swap letter g with letter b
reverse positions 3 through 6
rotate right 6 steps
rotate based on position of letter c
rotate based on position of letter b
rotate left 1 step
reverse positions 3 through 7
swap letter f with letter g
swap position 4 with position 1
rotate based on position of letter d
move position 0 to position 4
swap position 7 with position 6
rotate right 6 steps
rotate based on position of letter e
move position 7 to position 3
rotate right 3 steps
swap position 1 with position 2

32
day21/part1.js Normal file
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swapPos = (str, a, b)=>{
str = str.split("");
temp = str[a];
str[a] = str[b];
str[b] = temp;
return str.join("");
};
swapLetter = (str, a, b) => (str.split("").map((char)=>((char == a) ? (b) : ((char == b) ? (a) : (char)))).join(""));
rotate = (str, steps) => (str.split("").map((a, i)=>(str[(i + steps + str.length)%(str.length)])).join("")); //left pos, right neg
rotatePos = (str, char) => (str.split("").map((a, i)=>(str[(i - str.indexOf(char) - ((str.indexOf(char) >= 4) ? (2) : (1)) + (str.length*2))%(str.length)])).join(""));
reverseBetween = (str, a, b) => (str.split("").map((char, i)=>(((i >= a) && (i <= b)) ? (str[b - (i - a)]) : (char))).join(""));
moveToPos = (str, a, b) => {
var str = str.split("");
var char = str.splice(a, 1)[0];
str.splice(b, 0, char);
return str.join("");
};
var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, "");
var instructions = input.split("\n").filter((a)=>(a)).map((str)=>(
str
.replace(/swap position ([0-9]+) with position ([0-9]+)/g, "swapPos(text, $1, $2)")
.replace(/swap letter (.) with letter (.)/g, "swapLetter(text, \"$1\", \"$2\")")
.replace(/rotate left ([0-9]+) step(s)?/g, "rotate(text, $1)")
.replace(/rotate right ([0-9]+) step(s)?/g, "rotate(text, -$1)")
.replace(/rotate based on position of letter (.)/g, "rotatePos(text, \"$1\")")
.replace(/reverse positions ([0-9]+) through ([0-9]+)/g, "reverseBetween(text, $1, $2)")
.replace(/move position ([0-9]+) to position ([0-9]+)/g, "moveToPos(text, $1, $2)")
));
var out = instructions.reduce((text, instruction)=>(eval(instruction)), "abcdefgh")
console.log(out);

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day21/part2.js Normal file
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swapPos = (str, a, b)=>{
str = str.split("");
temp = str[a];
str[a] = str[b];
str[b] = temp;
return str.join("");
};
swapLetter = (str, a, b) => (str.split("").map((char)=>((char == a) ? (b) : ((char == b) ? (a) : (char)))).join(""));
rotate = (str, steps) => (str.split("").map((a, i)=>(str[(i + steps + str.length)%(str.length)])).join("")); //left pos, right neg
reverseRotatePos = (str, char) => (str.split("").map((a, i)=>(str[(i + ((str.indexOf(char)%2 == 0) ? (/*even*/ (((str.indexOf(char) == 0) ? (str.length) : (str.indexOf(char)))/2) + 5) : (/*odd*/ Math.ceil((str.indexOf(char))/2))) + (str.length*2))%(str.length)])).join(""));
reverseBetween = (str, a, b) => (str.split("").map((char, i)=>(((i >= a) && (i <= b)) ? (str[b - (i - a)]) : (char))).join(""));
moveToPos = (str, a, b) => {
var str = str.split("");
var char = str.splice(a, 1)[0];
str.splice(b, 0, char);
return str.join("");
};
var input = require("fs").readFileSync("input.txt").toString().replace(/\r/g, "");
var instructions = input.split("\n").reverse().filter((a)=>(a)).map((str)=>(
str
.replace(/swap position ([0-9]+) with position ([0-9]+)/g, "swapPos(text, $1, $2)")
.replace(/swap letter (.) with letter (.)/g, "swapLetter(text, \"$1\", \"$2\")")
.replace(/rotate left ([0-9]+) step(s)?/g, "rotate(text, -$1)")
.replace(/rotate right ([0-9]+) step(s)?/g, "rotate(text, $1)")
.replace(/rotate based on position of letter (.)/g, "reverseRotatePos(text, \"$1\")")
.replace(/reverse positions ([0-9]+) through ([0-9]+)/g, "reverseBetween(text, $1, $2)")
.replace(/move position ([0-9]+) to position ([0-9]+)/g, "moveToPos(text, $2, $1)")
));
var out = instructions.reduce((text, instruction)=>(eval(instruction)), "fbgdceah")
console.log(out);