attemps from before

2021/day1/day1.zig

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+const input = @embedFile("input1");
+const std = @import("std");
+
+pub fn main() !void{
+    var increments: usize = 0;
+    var t = std.mem.tokenize(u8, input, "\n");
+
+    var window = .{        
+        try std.fmt.parseInt(usize, t.next().?, 10),
+        try std.fmt.parseInt(usize, t.next().?, 10),
+        try std.fmt.parseInt(usize, t.next().?, 10),
+    };
+
+    while(t.next())|line|{
+        var sum1: usize = window[0] + window[1] + window[2];
+        
+        window[0] = window[1];
+        window[1] = window[2];
+        window[2] = try std.fmt.parseInt(usize, line, 10);
+        var sum2: usize = window[0] + window[1] + window[2];
+
+        if ( sum1 < sum2) increments += 1;
+
+    }
+
+    std.debug.print("result: {}", .{increments});
+}
+
+
+
+test "part1" {
+    var t = std.mem.tokenize(u8, input, "\n");
+
+    var last: usize = std.math.maxInt(usize);
+    var increments: usize = 0;
+
+    while(t.next()) |line| {
+        const n = try std.fmt.parseInt(usize, line, 10);
+        defer last = n;
+        if ( n > last) increments += 1;
+    }
+
+    try std.testing.expect(1583 == increments);
+
+}
+
+test "part2"{
+    var increments: usize = 0;
+    var t = std.mem.tokenize(u8, input, "\n");
+
+    // Read the first window
+    var window = .{        
+        try std.fmt.parseInt(usize, t.next().?, 10),
+        try std.fmt.parseInt(usize, t.next().?, 10),
+        try std.fmt.parseInt(usize, t.next().?, 10),
+    };
+
+    while(t.next())|line|{
+        //with this window, calculate the current window sum
+        var sum1: usize = window[0] + window[1] + window[2];
+        
+        //slide window one over
+        window[0] = window[1];
+        window[1] = window[2];
+        window[2] = try std.fmt.parseInt(usize, line, 10);
+
+        var sum2: usize = window[0] + window[1] + window[2];
+
+        if ( sum1 < sum2){
+            increments += 1;
+        } 
+
+    }
+
+    std.testing.expect(1627 == increments);
+}

2021/day1/input1.test

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+607
+618
+618
+617
+647
+716
+769
+792