commit 680da5cc2cecc002cca7dae841dec869ceaa312e
Author: Tarik Hijstek <t.hijstek@mailbox.org>
Date:   Fri Nov 25 22:36:13 2022 +0100

    attemps from before

diff --git a/2020/day1/day1.cs b/2020/day1/day1.cs
new file mode 100644
index 0000000..20d4d5a
--- /dev/null
+++ b/2020/day1/day1.cs
@@ -0,0 +1,6 @@
+int main(){
+    var input = File.ReadAllText(input1);
+    
+
+    return 0;
+}
\ No newline at end of file
diff --git a/2020/day1/day1.zig b/2020/day1/day1.zig
new file mode 100644
index 0000000..e400902
--- /dev/null
+++ b/2020/day1/day1.zig
@@ -0,0 +1,99 @@
+const std = @import("std");
+
+pub fn main() anyerror!void{
+    // fuck it, inline time
+    comptime const numbers: [200]u32 = .{
+        1695,1157,1484,1717,622,
+        1513,1924,63,1461,1971,
+        1382,1587,1913,1665,1464,
+        1914,1637,1527,1424,1361,
+        1187,272,1909,1448,1623,
+        1164,1931,1646,1096,1655,
+        1962,1961,1694,1792,1989,
+        1616,138,1887,1357,1965,
+        1085,308,2007,1254,1179,
+        1124,1719,1467,1928,1630,
+        1676,1359,1241,1511,1413,
+        1656,1818,1919,1422,1745,
+        1208,1609,1544,1775,1154,
+        1057,1440,1242,1202,1266,
+        1305,1836,1760,1730,1396,
+        1315,1496,1964,1300,1195,
+        1583,1607,1743,1682,1453,
+        1848,1320,1601,954,1473,
+        1847,1486,1853,1668,1342,
+        1087,1139,1349,1568,1728,
+        1420,1233,1073,1376,1658,
+        1477,1871,1958,1950,1503,
+        1758,1474,1203,1336,1981,
+        1309,1618,1846,1974,1940,
+        1333,1119,1756,1918,961,
+        1307,1375,1346,1611,1284,
+        84,1754,1608,2010,1341,
+        1136,1218,1882,1911,1288,
+        1930,1749,1952,1556,1757,
+        1761,1112,1963,1186,1373,
+        1622,1973,1330,1508,1222,
+        1226,1389,1679,1584,1237,
+        1563,1763,1998,1293,1642,
+        95,1661,1674,1100,1262,
+        1895,1548,1400,1205,1435,
+        1156,1034,1577,1701,1198,
+        1173,1500,1858,1809,1780,
+        1412,1982,1070,1523,1776,
+        1598,1113,1144,1777,1313,
+        1102,1999,1405,1784,1196,
+    };
+
+    var task1timer = try std.time.Timer.start();
+    var task1answer:u32 = task1(numbers);
+    var task1time = task1timer.read();
+    std.debug.print("T1 answer found in : {0}ns \n", .{task1time});
+    std.debug.print("T1 answer is: {0} \n", .{task1answer});
+
+    std.debug.print("\n",.{});
+
+    var task2timer = try std.time.Timer.start();
+    var task2answer:u32 = task2(numbers);
+    var task2time = task2timer.read();
+    std.debug.print("T2 answer found in : {0}ns \n", .{task2time});
+    std.debug.print("T2 answer is: {0} \n", .{task2answer});
+}
+
+pub fn task2(numbers: [200]u32)u32{
+     for(numbers)|num1|{
+        for(numbers)|num2|{
+            if(num1+num2 > 2020){
+                continue;
+            }
+            var num3 = (2020 - (num1+num2));
+            if(isInArray(num3, &numbers)){
+                return num3 * num2 * num1;
+            }
+        }
+    }else{
+        return 0;
+    }
+}
+
+pub fn task1(numbers: [200]u32)u32{
+    for(numbers)|num|{
+        var num1 = 2020 - num;
+        if(isInArray(num1, &numbers)){
+            return num1*num;
+        }
+    }else{
+        return 0;
+    }
+}
+
+
+pub fn isInArray(num: u32, arr: *const [200]u32)bool{
+    for(arr)|checkee|{
+        if(checkee == num){
+            return true;
+        }
+    }
+    return false;
+
+}
diff --git a/2020/day1/day1File.zig b/2020/day1/day1File.zig
new file mode 100644
index 0000000..9346f53
--- /dev/null
+++ b/2020/day1/day1File.zig
@@ -0,0 +1,68 @@
+const std = @import("std");
+const warn = std.debug.warn;
+
+pub fn main() anyerror!void{
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+    
+    const allocator = &arena.allocator;
+
+    //read data from file.
+        //each line is one number
+    var file = try std.fs.cwd().openFile("input1", .{});
+    defer file.close();
+
+    const file_size:u64 = try file.getEndPos();
+    std.debug.print("{0} \n", .{file_size});
+    
+    var buffer = try allocator.alloc(u8, file_size);
+    var reader = file.reader();
+    
+    var size = try reader.read(buffer);
+
+    std.debug.print("{0} \n", .{buffer});
+
+//read from buffer
+//put value in array
+//is value 10?
+//finish array, interpret as int32.
+const numberArr: []u32 = try allocator.alloc(u32, 4);
+var i:i32 = 0;
+
+for(buffer) |byte|{
+    if(byte == 10){
+        i=0;
+        //std.debug.print("{0}", .{@as(i32,numberArr)});
+
+    }else{
+        //numberArr.push(byte);
+    }
+    i += 1;
+}
+
+    // for(buffer) |byte|{
+    //     if(byte == 10){
+    //         std.debug.print("Newline!\n", .{});
+    //     }else{
+    //         std.debug.print("{0}", .{byte});
+    //     }
+    // }
+    
+
+
+
+//what two numbers from the input file add up to 2020?
+//once those two numbers have been found, multiply them
+
+
+//naive:
+//foreach number |num1|
+//foreach number |num2|
+//if(num1+num2 = 2020)
+//return num1*num2
+
+//v2
+//foreach number |num1|
+// if(number.contains(2020-num1))
+//      return num1*(num2;
+}
\ No newline at end of file
diff --git a/2020/day1/input1 b/2020/day1/input1
new file mode 100644
index 0000000..208b522
--- /dev/null
+++ b/2020/day1/input1
@@ -0,0 +1,200 @@
+1695
+1157
+1484
+1717
+622
+1513
+1924
+63
+1461
+1971
+1382
+1587
+1913
+1665
+1464
+1914
+1637
+1527
+1424
+1361
+1187
+272
+1909
+1448
+1623
+1164
+1931
+1646
+1096
+1655
+1962
+1961
+1694
+1792
+1989
+1616
+138
+1887
+1357
+1965
+1085
+308
+2007
+1254
+1179
+1124
+1719
+1467
+1928
+1630
+1676
+1359
+1241
+1511
+1413
+1656
+1818
+1919
+1422
+1745
+1208
+1609
+1544
+1775
+1154
+1057
+1440
+1242
+1202
+1266
+1305
+1836
+1760
+1730
+1396
+1315
+1496
+1964
+1300
+1195
+1583
+1607
+1743
+1682
+1453
+1848
+1320
+1601
+954
+1473
+1847
+1486
+1853
+1668
+1342
+1087
+1139
+1349
+1568
+1728
+1420
+1233
+1073
+1376
+1658
+1477
+1871
+1958
+1950
+1503
+1758
+1474
+1203
+1336
+1981
+1309
+1618
+1846
+1974
+1940
+1333
+1119
+1756
+1918
+961
+1307
+1375
+1346
+1611
+1284
+84
+1754
+1608
+2010
+1341
+1136
+1218
+1882
+1911
+1288
+1930
+1749
+1952
+1556
+1757
+1761
+1112
+1963
+1186
+1373
+1622
+1973
+1330
+1508
+1222
+1226
+1389
+1679
+1584
+1237
+1563
+1763
+1998
+1293
+1642
+95
+1661
+1674
+1100
+1262
+1895
+1548
+1400
+1205
+1435
+1156
+1034
+1577
+1701
+1198
+1173
+1500
+1858
+1809
+1780
+1412
+1982
+1070
+1523
+1776
+1598
+1113
+1144
+1777
+1313
+1102
+1999
+1405
+1784
+1196
diff --git a/2020/day2/day2.zig b/2020/day2/day2.zig
new file mode 100644
index 0000000..936c62b
--- /dev/null
+++ b/2020/day2/day2.zig
@@ -0,0 +1,73 @@
+const std = @import("std");
+
+
+pub fn main() anyerror!void{
+    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    defer arena.deinit();
+
+    const allocator = &arena.allocator;
+
+    //format:
+        //[d-d] [c]: [password]
+    //[minamount [sperator] maxamount] [character]: [password]
+
+    var file = try std.fs.cwd().openFile("input2", .{});
+    defer file.close();
+
+    const file_size:u64 = try file.getEndPos();
+    std.debug.print("{0} \n", .{file_size});
+    
+    //var buffer = try allocator.alloc(u8, file_size);
+    //var reader = file.reader();
+    
+    //var size = try reader.read(buffer);
+
+    //std.debug.print("{0} \n", .{buffer});
+    try file.seekTo(0);
+
+    const contents = try file.reader().readAllAlloc(
+        allocator,
+        file_size
+    );
+    defer allocator.free(contents);
+
+    // const passBuffer = try allocator.alloc(u8, 40); //get a 40 char buffer
+    // defer allocator.free(passBuffer);
+
+    const ArrayList = std.ArrayList;
+    var list = ArrayList(u8).init(allocator);
+    defer list.deinit();
+
+    for(contents)|char,index|{
+        if(char == 12){
+            std.debug.print("\n", .{});
+            //end of line, so clear everything
+
+            continue;
+        }
+        if(char == 45){
+            //current char is (-), so we take the input so far
+            //and set it as the min
+            for(list)|didget|{
+                
+            }
+        }
+
+        list.append(char);
+
+        //put byte in buffer
+        //is current byte a dash (-)?
+            //yes, then this is min
+        //read untill space
+            //from (-) until the space, is the max
+
+        std.debug.print("{c}", .{char});
+
+    }
+}
+
+pub fn isPassValid(char:u8, amountMin:i32, amountMax:i32, input: []u8 )bool{
+    //in here check if password is valid
+    return false;
+
+}
\ No newline at end of file
diff --git a/2020/day2/input2 b/2020/day2/input2
new file mode 100644
index 0000000..32ae92c
--- /dev/null
+++ b/2020/day2/input2
@@ -0,0 +1,1000 @@
+2-6 w: wkwwwfwwpvw
+14-15 v: hvhvlhvvvwxvdvscdpvg
+2-3 b: bkkb
+3-4 v: wgvvzvhcvlrvjvvmv
+11-12 c: cccccccccqcccckcc
+2-5 z: zkzpzlzzzzz
+7-13 x: xxxxxxxxxxxxxxx
+7-10 f: zffxbwffqfxfffxf
+16-17 h: hvhhhhhhhhhhhhhrt
+2-3 k: krjkk
+10-11 k: kkkkkkkkkkg
+17-20 d: dmfpddzdlddtvdddwdtk
+3-5 m: tdwmmmmj
+4-6 b: ncdbbpgxrg
+8-13 d: bdfddglkdddgqwdfczs
+2-5 s: tsszkhgf
+2-3 k: zbkt
+5-9 k: qqwmdqkzkldhpjql
+4-6 p: bpjfhrpd
+10-11 r: rrrxrrrrwhrrrr
+6-9 n: nnxnwnnnbl
+4-6 k: kmgpkkjd
+4-5 v: vvdgv
+3-4 h: jhhh
+5-14 n: gnsnnnlvbzcsjjwqj
+14-17 f: qfqffffqffnlwcffz
+11-12 j: mchrqljrjhjjhjvmjwb
+1-4 k: kkkkk
+13-14 q: qqqqqqqqxqqqqlqq
+1-3 k: cmkrdptlkxlkh
+7-9 m: mmmmmmmmmm
+4-10 b: brbxqbbblb
+3-4 f: fqdff
+3-4 r: rqrpzrr
+6-7 n: cknndnngpnnn
+2-6 b: pkbbbbb
+3-9 s: lssssssjswzss
+1-6 m: kmmmmmmmmmm
+1-4 n: nnnnnn
+3-4 p: pppqp
+7-16 s: ssnslsmshfsvstxsprw
+1-5 x: nxxxxxx
+2-4 q: qcqqhq
+4-5 r: rrprz
+2-5 q: kqqqqqq
+6-7 m: nggpmcm
+4-9 r: rrrrrrrrr
+3-6 j: zqjpzkkpspsjs
+1-4 h: hhhs
+4-8 l: wlqgklsl
+6-7 f: zxfwcpf
+5-17 g: cgvfqmggggqggggzgw
+2-13 m: mpsmmmmmmmmmmmm
+8-12 b: bdbbblbbbbxkbmb
+17-18 z: zzzzzzzzzzzzzzzzjz
+6-11 h: dlkhchqxthn
+1-6 x: lxxxxxsxdxdhxxfj
+3-4 m: mmpm
+4-8 l: ncphmhtldmrtvslrbt
+14-15 c: ncgjthcdvgjcwcjz
+4-5 s: bsjsssbt
+2-5 j: psjvjzbghz
+11-12 b: bbbbbbbbbbbbl
+6-7 b: bbbbbbb
+6-7 k: kkkkkkps
+9-10 w: wwwcrxcwwwwwwf
+1-3 k: rkkk
+4-5 q: dqxcq
+2-14 v: vhhtvgwvdhvmqvmsp
+2-3 c: nbzrfvv
+5-9 h: hhkvmrxhsf
+3-5 v: bdlgvcqftvvx
+8-9 p: ppppppppw
+4-6 f: dfkfdf
+7-8 m: mnnmmqwmmzjfb
+11-17 w: wgwwwwwwwwwwwwjbwwww
+1-5 q: ccbwhgqszgnqtf
+1-6 d: dkxxddd
+5-10 c: ccccrcckccccc
+10-13 x: rxcxxxxxhxcxkxxx
+2-6 p: pppppfp
+4-5 k: mkjnkmtkkpk
+7-14 f: ffffffkwfffhpf
+8-9 h: hhhhhhhwwhhhh
+3-4 r: rrrrr
+3-4 t: swptmltp
+7-10 l: lmllgllwll
+6-13 q: zqnrkqpqcdfnqvdnlrqq
+2-3 k: ccvmrkxl
+11-15 l: llllllllllllllpll
+11-18 v: vvvgvvvvvtmvrvvvsqv
+11-14 t: dshqbfvbdttqcx
+7-8 n: wghnnnwnnnmvnn
+4-7 b: bpxcbffcsr
+6-10 l: rnlnwlmvtl
+17-20 j: jjvjjjjjjsjjjjjtmjjz
+5-8 g: mvcfkrfcgppfjv
+3-11 f: crzfpxmtlkwwnnfrd
+4-6 v: vvvvmsvd
+3-7 d: dddddddd
+10-11 m: mmmmmmmkmgmm
+5-10 s: jgsssgsssqsh
+12-18 g: fbggtqvjggxmgggjkg
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+10-15 r: rrrrrrdrrrrrjrr
+13-16 p: ppppppbppppppwpmppp
+5-11 z: zbmxftzzzzmz
+11-13 k: jkkxkkkkvkwkkkkvk
+6-7 n: nnntnnz
+8-11 j: gjjjjnjkdjqpjtj
+2-4 x: xxxjj
+2-13 r: rgnrlpwrbrrxvrrrrzw
+5-6 p: pppppp
+14-16 n: pcnnxqnglnnznngn
+1-2 f: fffffx
+4-5 d: ddpvcdv
+2-3 n: kfnn
+4-6 q: qbhbcwmhph
+5-6 p: pnbccxp
+5-9 v: vvvvvvvvmv
+2-4 x: rjsv
+9-16 x: xxxxxxxxmxxxxxxnx
+2-5 j: jdjbjjjjj
+6-12 t: tttgtttltbtnhrtgk
+7-10 v: vvvvvvvvvsv
+4-7 h: zmlhhpljhjjhqfh
+8-9 m: mmmxmsmkmmmm
+10-11 z: zzzzzzzzztwz
+6-11 x: xxxxxxxxxxhxxxxxxx
+1-13 g: gggfgggggggggggggz
+14-15 f: frjzssdfnnzflffpsqfj
+10-18 f: fffffffffffffffffff
+3-4 s: ssmg
+13-14 t: ttttttttttttgt
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+4-5 n: nsnptgcccnrtc
+9-10 z: zzzzzzzzzrz
+7-8 m: pmcgtmmmmmxmvm
+6-9 x: xxxxfxxxq
+2-4 w: wwws
+9-17 h: hbhhcvhrhctvhhhhx
+2-11 k: qfnkfhlbfkshtqvcnk
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+3-5 v: pgsjv
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+6-8 k: ppkhkkgkjkqjkkhzkbv
+1-2 f: pfcm
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+3-4 f: fffsjqff
+7-13 x: kxwpsxxwqkxtx
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+1-3 q: qqqq
+4-7 s: pdsdmsssm
+2-9 d: dtzdfddmcbtddjddc
+4-5 j: jjhjjj
+1-5 l: ldjll
+7-11 m: mmwmmlmmmmmmm
+9-11 b: bklmbbbbbdmfb
+4-9 b: bbbbbbbbbbb
+10-14 h: jhgchkhkhhhhhqhh
+5-6 g: lhqrggfngdkrdthzlvxg
+3-4 z: zzzzzzzz
+2-6 z: lptzfpx
+1-4 m: msjscmmmcmpcj
+6-7 k: xsklqkq
+8-16 m: mmmmmmmmmmmmmmmmmm
+1-13 k: kjzbztnmnqkckcgkt
+15-17 d: ddmckddddkfqdmddn
+4-7 t: tzttvbtxltst
+2-12 t: ntkdzntftxnjl
+3-5 t: tttttt
+7-10 t: ttfgtlfhftzkft
+1-3 z: bzbzz
+4-5 q: wqkqp
+13-14 s: mssssssscssssvcxs
+1-11 t: ttttttttxts
+6-8 x: xxxxsxxxxsf
+1-3 g: cxngg
+12-14 h: hvhbhhnhhhhhhhh
+1-5 q: qqqqqq
+4-8 n: nnhnkzzrbgwtbvnprnjx
+2-5 t: qrlttrdf
+5-6 h: hhhhhlhhh
+1-12 w: wwwwwwfgqwggwxwfwbw
+6-10 p: pppppppppcppp
+12-13 k: klpvkmrlnkfpmv
+2-7 n: nnpswzxxhd
+4-6 k: pnkgkqrhg
+7-9 g: ggggzgqgngm
+9-12 d: ddkddddddpdd
+4-9 l: lhhlxcsqlkxxsbj
+9-16 c: ccdcckrccchcccpccs
+5-11 l: jshrlcrlkxqp
+4-6 c: cwcvcccctcc
+6-8 d: dsbmlddlqc
+4-6 r: frrrhsb
+1-2 f: frhhfjgffwnnf
+5-13 b: bbbbbbbbbbbbbbbbb
+5-13 g: jnxbjmfbgmmbg
+1-9 g: gkggrbggg
+1-9 z: zzzzzzzzzzz
+15-16 k: kkkkkkkkkkkkkkks
+3-4 b: bttm
+7-8 k: kkkkkkkt
+13-14 f: ffffsffffffffj
+8-9 q: dqqqqqqwfqqbq
+4-5 m: mmfvm
+4-10 z: hzjzprfqtzfzlcdpvm
+19-20 x: xxxxxxxxxxxzxxxxxxxc
+10-11 l: lzllldlllhlllcpll
+9-15 l: lflllblllllqllhl
+6-9 c: ccccczccxvckck
+7-14 w: xjchwqvkfgswpwpskc
+3-6 v: vvvxtb
+3-5 f: ffksvqx
+10-12 m: nxztknmwgmfgq
+4-7 n: nbcwzbvhgnnn
+3-4 d: pdhdgwdd
+10-13 l: ltmwlllxlltclqpllp
+16-20 t: tttttttttttttttttttt
+6-7 z: gflqpzzzpx
+1-6 x: fxtmtlxgxl
+2-3 r: rsrr
+2-16 p: tpsthmqblbjdvxfspm
+13-15 c: ccccccccccccccc
+8-9 f: fffkfxfgfff
+1-6 f: fzfffjf
+5-6 d: dddcdrd
+3-5 f: fffffff
+5-6 h: gchlpkxhshhh
+2-3 n: rnvx
+1-3 d: dmfp
+7-8 g: ggzggjwgkg
+8-13 n: cndnnknvpnvnnn
+2-4 z: xztz
+2-3 h: hhzzm
+4-5 c: ccccckzdqcw
+5-9 w: qqwwwwvsw
+1-2 g: ggmgggjg
+6-7 g: bggxggkgsmgg
+4-7 j: zrjgsvj
+4-6 g: vgccgdc
+1-11 m: cnmbjlmhlqx
+8-12 m: mmmmmbmmmmgmsmmm
+14-15 n: nwpnnnnnnnnnnnnnpn
+14-18 k: tkkkkpkkpkkkkkxhkj
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\ No newline at end of file
diff --git a/2021/day1/day1.zig b/2021/day1/day1.zig
new file mode 100644
index 0000000..857387d
--- /dev/null
+++ b/2021/day1/day1.zig
@@ -0,0 +1,76 @@
+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);
+}
\ No newline at end of file
diff --git a/2021/day1/input1 b/2021/day1/input1
new file mode 100644
index 0000000..0bed5fe
--- /dev/null
+++ b/2021/day1/input1
@@ -0,0 +1,2000 @@
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diff --git a/2021/day1/input1.test b/2021/day1/input1.test
new file mode 100644
index 0000000..3b0be38
--- /dev/null
+++ b/2021/day1/input1.test
@@ -0,0 +1,8 @@
+607
+618
+618
+617
+647
+716
+769
+792
\ No newline at end of file
diff --git a/2021/day2/day2.zig b/2021/day2/day2.zig
new file mode 100644
index 0000000..4c49499
--- /dev/null
+++ b/2021/day2/day2.zig
@@ -0,0 +1,70 @@
+const input = @embedFile("input2");
+const std = @import("std");
+
+pub fn main() !void{
+
+    var horizontal: usize = 0;
+    var depth: usize = 0;
+    var aim: usize = 0;
+
+    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string
+
+    while(iter.next())|direction|{
+        var value = try std.fmt.parseInt(usize, iter.next().?, 10);
+
+        if(std.mem.eql(u8, direction, "up")){ aim -= value; }
+        if(std.mem.eql(u8, direction, "down")){ aim += value; }
+        if(std.mem.eql(u8, direction, "forward")){ 
+            horizontal += value; 
+            depth += (aim * value);
+        }
+    }
+
+    std.debug.print("result: {}", .{depth * horizontal});
+}
+
+test "Part 1"{
+
+    var horizontal: usize = 0;
+    var depth: usize = 0;
+
+    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string
+
+    while(iter.next())|direction|{
+        var value = try std.fmt.parseInt(usize, iter.next().?, 10);
+
+        if(std.mem.eql(u8, direction, "forward")){ horizontal += value; }
+        if(std.mem.eql(u8, direction, "up")){ depth -= value; }
+        if(std.mem.eql(u8, direction, "down")){ depth += value; }
+
+    }
+
+
+    std.testing.expect(1762050 == (depth * horizontal));
+}
+
+
+
+
+test "part 2"{
+
+    var horizontal: usize = 0;
+    var depth: usize = 0;
+    var aim: usize = 0;
+
+    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string
+
+    //First token is the direction
+    while(iter.next())|direction|{
+        var value = try std.fmt.parseInt(usize, iter.next().?, 10);
+
+        if(std.mem.eql(u8, direction, "up")){   aim -= value; }
+        if(std.mem.eql(u8, direction, "down")){ aim += value; }
+        if(std.mem.eql(u8, direction, "forward")){ 
+            horizontal  += value; 
+            depth       += (aim * value);
+        }
+    }
+
+    std.testing.expect(1855892637 == (depth * horizontal));
+}
\ No newline at end of file
diff --git a/2021/day2/input2 b/2021/day2/input2
new file mode 100644
index 0000000..dec59fb
--- /dev/null
+++ b/2021/day2/input2
@@ -0,0 +1,1000 @@
+forward 2
+forward 5
+forward 5
+down 4
+forward 8
+down 1
+forward 2
+forward 2
+down 9
+down 2
+forward 6
+forward 3
+down 9
+down 2
+forward 4
+up 2
+forward 7
+up 6
+forward 8
+forward 4
+up 5
+forward 3
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+forward 6
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+up 3
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+forward 1
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+up 1
+down 7
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+down 7
+down 6
+forward 5
+up 6
+forward 9
+down 9
+up 3
+down 6
+down 1
+forward 6
+up 1
+down 1
+up 3
+up 7
+forward 1
+down 5
+forward 7
+forward 3
+down 9
+up 8
+forward 1
+down 4
+up 1
+forward 9
+forward 7
+down 2
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+down 2
+down 5
+down 2
+up 1
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+forward 4
+forward 8
+forward 3
+forward 3
+forward 1
+down 1
+forward 1
+down 7
+up 7
+down 3
+down 1
+down 7
+down 4
+forward 7
+forward 5
+down 9
+down 5
+forward 3
+up 7
+down 2
+up 1
+forward 1
+forward 2
+down 7
+down 3
+forward 7
+up 4
+forward 3
+up 8
+down 9
+down 4
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+forward 6
+down 3
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+down 4
+down 9
+down 8
+forward 6
+down 3
+down 1
+down 9
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+forward 9
+forward 2
+up 5
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+up 7
+up 2
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diff --git a/2021/day2/input2.test b/2021/day2/input2.test
new file mode 100644
index 0000000..b7172ac
--- /dev/null
+++ b/2021/day2/input2.test
@@ -0,0 +1,6 @@
+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2
diff --git a/2021/day3/day3.zig b/2021/day3/day3.zig
new file mode 100644
index 0000000..4091b89
--- /dev/null
+++ b/2021/day3/day3.zig
@@ -0,0 +1,85 @@
+const input = @embedFile("input3");
+const std = @import("std");
+
+pub fn main() !void{
+
+
+    var counting = [1]usize{0} ** 12;
+
+    var iter = std.mem.tokenize(u8, input, "\n");
+    while(iter.next() ) |line| {
+
+        for(line)|c, i|{
+            counting[i] += (c -48); //HACK: subtract 48 to go from ascii to bit
+        }
+
+
+        //@popCount(u8,line); // >=3 means 1 is most common bit.
+    }
+
+
+    //
+    var gamma:  u12 = 0;
+    var epsilon:u12 = 0;
+    
+    for(counting)|count, i|{
+
+        if(count > 500){
+            counting[i] = 1;
+        }else{
+            counting[i] = 0;
+        }
+    }
+
+
+    for(counting)|c, i|{
+        if(c == 1) gamma |= @as(u12, 1) << @intCast(u4,i ) ;
+    }
+
+    gamma = @bitReverse(u12, gamma);
+    epsilon = ~gamma;
+
+    const result: u64 = gamma * @as(u64, epsilon);
+
+    std.debug.print("result: {}", .{result});
+}
+
+test "part 1"{
+
+
+    var counting = [1]usize{0} ** 12;
+
+    var iter = std.mem.tokenize(u8, input, "\n");
+    while(iter.next() ) |line| {
+
+        for(line)|c, i|{
+            counting[i] += (c -48); //HACK: subtract 48 to go from ascii to bit
+        }
+
+    }
+
+
+    //
+    var gamma:  u12 = 0;
+    var epsilon:u12 = 0;
+    
+    for(counting)|count, i|{
+
+        if(count > 500){
+            counting[i] = 1;
+        }else{
+            counting[i] = 0;
+        }
+    }
+
+
+    for(counting)|c, i|{
+        if(c == 1) gamma |= @as(u12, 1) << @intCast(u4,i ) ;
+    }
+
+    gamma = @bitReverse(u12, gamma);
+    epsilon = ~gamma;
+    const result: u64 = gamma * @as(u64, epsilon);
+
+    std.testing.expect(2648450 == result);
+}
diff --git a/2021/day3/input3 b/2021/day3/input3
new file mode 100644
index 0000000..5bd6997
--- /dev/null
+++ b/2021/day3/input3
@@ -0,0 +1,1000 @@
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diff --git a/2021/day3/input3.test b/2021/day3/input3.test
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/2021/day3/input3.test
@@ -0,0 +1,12 @@
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diff --git a/2021/day4/day4.zig b/2021/day4/day4.zig
new file mode 100644
index 0000000..e69de29
diff --git a/2021/day4/input4.zig b/2021/day4/input4.zig
new file mode 100644
index 0000000..e69de29