Day 1 and 2 :)

2023-12-02 12:23:56 +00:00
parent 193a07cc48
commit 8f9e94699d
8 changed files with 344 additions and 1 deletions
--- a/AdventOfCode2023/src/day1/day1.zig
+++ b/AdventOfCode2023/src/day1/day1.zig
@@ -0,0 +1,168 @@
+const std = @import("std");
+const mem = std.mem;
+const ArrayList = std.ArrayList;
+
+pub fn solve(input: [][]const u8) !void {
+    var part1: usize = 0;
+
+    for (input) |line| {
+        var firstDigit: usize = 0;
+        for (line) |char| {
+            if (char >= '0' and char <= '9') {
+                firstDigit = char - '0';
+                break;
+            }
+        }
+
+        var lastDigit: usize = 0;
+        for (line) |char| {
+            if (char >= '0' and char <= '9') {
+                lastDigit = char - '0';
+            }
+        }
+
+        part1 += firstDigit * 10 + lastDigit;
+    }
+
+    std.debug.print("Part 1: {}\n", .{part1});
+
+    var part2: usize = 0;
+
+    for (input) |line| {
+        var firstDigit: usize = 0;
+        var index: usize = 0;
+
+        for (line) |char| {
+            if (char >= '0' and char <= '9') {
+                firstDigit = char - '0';
+                break;
+            }
+            index += 1;
+        }
+
+        if (std.mem.indexOf(u8, line, "one")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 1;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "two")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 2;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "three")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 3;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "four")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 4;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "five")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 5;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "six")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 6;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "seven")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 7;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "eight")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 8;
+            }
+        }
+        if (std.mem.indexOf(u8, line, "nine")) |position| {
+            if (position < index) {
+                index = position;
+                firstDigit = 9;
+            }
+        }
+
+        var lastDigit: usize = 0;
+        var currentIndex: usize = 0;
+        var indexLast: usize = 0;
+        for (line) |char| {
+            if (char >= '0' and char <= '9') {
+                lastDigit = char - '0';
+                indexLast = currentIndex;
+            }
+            currentIndex += 1;
+        }
+
+        if (std.mem.lastIndexOf(u8, line, "one")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 1;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "two")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 2;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "three")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 3;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "four")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 4;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "five")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 5;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "six")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 6;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "seven")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 7;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "eight")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 8;
+            }
+        }
+        if (std.mem.lastIndexOf(u8, line, "nine")) |position| {
+            if (position > indexLast) {
+                indexLast = position;
+                lastDigit = 9;
+            }
+        }
+
+        part2 += firstDigit * 10 + lastDigit;
+    }
+
+    std.debug.print("Part 2: {}\n", .{part2});
+}