From 26ad8650008319b75e4a7143a21ceebe728e5274 Mon Sep 17 00:00:00 2001
From: cupcakearmy <hi@nicco.io>
Date: Tue, 8 Dec 2020 16:41:03 +0100
Subject: [PATCH] 8

---
 solutions/8/README.md      |  15 +
 solutions/8/data.txt       | 613 +++++++++++++++++++++++++++++++++++++
 solutions/8/python/main.py |  63 ++++
 solutions/8/test.txt       |   9 +
 4 files changed, 700 insertions(+)
 create mode 100644 solutions/8/README.md
 create mode 100644 solutions/8/data.txt
 create mode 100644 solutions/8/python/main.py
 create mode 100644 solutions/8/test.txt

diff --git a/solutions/8/README.md b/solutions/8/README.md
new file mode 100644
index 0000000..3dbd044
--- /dev/null
+++ b/solutions/8/README.md
@@ -0,0 +1,15 @@
+# 8
+
+Keep getting better! Today we write a little state machine, love it.
+
+So firstly we remember what `oc` (Operation Counter) we have already visited and if so we simply stop and return the accumulator.
+
+For I basically run the code many times, inverting `nop` to `jmp` and vice versa until i found a working instruction set.
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>1087</li>
+    <li>780</li>
+  </ol>
+</details>
diff --git a/solutions/8/data.txt b/solutions/8/data.txt
new file mode 100644
index 0000000..1334a3f
--- /dev/null
+++ b/solutions/8/data.txt
@@ -0,0 +1,613 @@
+nop +456
+nop +38
+acc +9
+jmp +153
+acc +15
+nop +560
+jmp +452
+acc +26
+acc +42
+jmp +376
+acc -5
+acc +12
+acc -5
+jmp +15
+jmp +1
+acc -9
+jmp +533
+acc +19
+acc +33
+acc +34
+jmp -6
+nop +404
+nop +140
+acc +0
+jmp +123
+acc +45
+acc +0
+jmp +496
+jmp +487
+acc +9
+acc +34
+jmp +484
+acc +0
+acc -14
+jmp +466
+acc +40
+acc +6
+acc +30
+jmp +444
+nop +386
+jmp +215
+acc +43
+acc +5
+nop -4
+jmp +535
+jmp -13
+acc +3
+acc +7
+acc +49
+acc -1
+jmp +245
+acc +9
+acc +31
+nop +142
+jmp +554
+acc +3
+jmp +493
+nop +399
+jmp +232
+acc -16
+acc +33
+jmp +410
+acc +33
+acc +5
+acc -17
+jmp +272
+acc -3
+acc +37
+jmp +181
+jmp -12
+nop +344
+acc +5
+acc -16
+jmp +290
+nop +530
+acc +15
+acc +3
+jmp +343
+acc +2
+acc +19
+jmp +298
+acc +43
+acc +25
+acc -19
+jmp +439
+acc +43
+acc +45
+acc +20
+jmp +355
+acc +13
+acc +24
+acc -15
+nop +396
+jmp +215
+acc -7
+acc +17
+jmp +441
+acc -8
+acc -19
+jmp +505
+jmp +282
+acc -17
+acc -8
+acc +20
+jmp +359
+acc +26
+acc +14
+acc +47
+acc +3
+jmp +298
+acc +31
+nop +205
+acc +0
+acc +7
+jmp +389
+acc -5
+acc +47
+jmp +94
+acc -13
+jmp +358
+acc -13
+jmp +134
+acc +8
+acc -19
+jmp +312
+acc +43
+acc +17
+jmp +97
+jmp +48
+nop +253
+acc +48
+acc -7
+acc -2
+jmp +23
+acc +26
+acc +14
+acc -14
+acc +17
+jmp +18
+acc +14
+acc +8
+jmp +341
+acc +35
+jmp +227
+acc +15
+acc -7
+jmp -95
+acc -19
+jmp -59
+jmp -31
+acc -6
+acc -4
+acc +24
+jmp +84
+acc -15
+jmp +82
+nop +74
+acc +8
+acc +9
+acc +13
+jmp +194
+jmp +376
+acc +34
+nop -16
+jmp -90
+acc +4
+acc +43
+nop +215
+jmp -147
+acc +0
+acc +11
+acc -15
+acc +23
+jmp +130
+acc +40
+jmp +106
+acc -4
+acc -18
+acc +18
+nop +329
+jmp +230
+acc +19
+nop +172
+acc +43
+jmp +304
+acc +44
+nop +213
+nop +195
+acc +6
+jmp -79
+acc +41
+acc -11
+acc +18
+acc -9
+jmp -25
+acc +27
+acc -6
+acc +31
+jmp -56
+acc +5
+acc +12
+acc +32
+acc +34
+jmp -189
+acc +32
+acc +5
+acc -16
+jmp +301
+nop +108
+nop -108
+jmp -141
+acc -12
+jmp +273
+acc +3
+jmp +140
+acc +7
+acc -11
+acc -17
+nop +194
+jmp -122
+acc -14
+nop +186
+acc +24
+jmp +277
+nop +341
+acc +18
+jmp -64
+acc +45
+acc +42
+jmp +52
+acc +39
+nop +91
+nop -8
+jmp +217
+acc +44
+acc +15
+jmp +72
+acc +24
+jmp -231
+acc -16
+nop +55
+nop +262
+acc +40
+jmp +234
+jmp -14
+acc +31
+nop -177
+acc +40
+jmp +343
+acc -8
+jmp -169
+acc +30
+acc +12
+acc -11
+jmp +41
+acc +9
+acc -9
+jmp +65
+acc +38
+acc +14
+jmp +335
+acc -19
+acc +38
+acc +16
+acc -11
+jmp +230
+jmp -71
+acc +48
+acc -13
+nop -255
+jmp +1
+jmp -220
+acc +2
+jmp +157
+jmp -105
+acc -16
+acc -5
+jmp -196
+acc +30
+jmp +139
+jmp +83
+acc -3
+acc -12
+jmp +254
+jmp -60
+acc +33
+jmp -37
+acc +17
+acc -14
+jmp +93
+nop +178
+acc +38
+acc +47
+jmp -89
+jmp +271
+acc +43
+acc +32
+jmp -240
+acc +26
+acc +32
+acc +30
+nop +284
+jmp +169
+acc -7
+acc +37
+jmp +102
+acc +4
+jmp +86
+jmp -123
+acc +0
+acc -14
+acc +18
+jmp +1
+jmp -5
+jmp -36
+jmp +148
+acc -17
+acc -14
+acc +28
+acc +15
+jmp +79
+jmp -289
+acc +42
+acc -5
+acc +13
+jmp +240
+acc -10
+acc -18
+acc -16
+jmp +103
+acc +21
+jmp +32
+nop +118
+acc +22
+acc -16
+acc +15
+jmp -186
+acc -2
+acc -14
+acc +22
+acc +16
+jmp +73
+acc -6
+jmp -225
+acc -18
+nop +113
+acc +50
+acc -6
+jmp +181
+acc +41
+jmp +1
+nop +92
+acc +23
+jmp +190
+acc +39
+acc +0
+acc +33
+jmp +111
+nop -63
+nop -81
+acc +9
+acc +35
+jmp +50
+acc +11
+jmp -295
+nop +230
+acc +34
+acc +12
+acc +47
+jmp +126
+acc +0
+nop -1
+acc +19
+acc -16
+jmp -360
+acc +29
+acc -2
+jmp -110
+acc +2
+acc +50
+jmp -36
+jmp -107
+jmp +178
+acc -11
+jmp +181
+nop +115
+nop +186
+jmp +95
+jmp +1
+nop +148
+acc +2
+acc +49
+jmp +173
+acc +38
+jmp +178
+acc +28
+acc +6
+acc +15
+jmp +110
+acc +49
+nop +100
+jmp +57
+acc +45
+nop +65
+acc +43
+acc +12
+jmp -272
+jmp -260
+nop +100
+jmp -224
+jmp +142
+jmp +52
+jmp -34
+jmp -110
+acc +35
+nop -112
+jmp +16
+jmp -18
+jmp -157
+jmp +81
+acc +1
+jmp -107
+acc +16
+acc +23
+jmp -255
+acc +22
+jmp +42
+nop +168
+acc +41
+jmp -311
+jmp -163
+jmp +118
+nop +4
+acc +18
+jmp +54
+jmp -414
+nop -181
+acc +10
+acc +23
+jmp -321
+nop -322
+acc -9
+jmp +101
+nop -7
+acc +35
+acc +46
+jmp -312
+nop +64
+nop -386
+jmp -280
+acc +16
+jmp -156
+acc +13
+nop -131
+jmp +1
+jmp -416
+jmp +15
+jmp -94
+jmp -330
+nop +93
+nop -205
+acc +48
+jmp -19
+jmp -70
+nop +21
+acc -5
+acc +19
+jmp +62
+acc +22
+jmp -448
+jmp -77
+acc +26
+acc -2
+jmp +70
+acc -2
+acc +21
+jmp -195
+nop -114
+jmp +107
+acc +37
+acc +6
+jmp -436
+acc +48
+jmp +96
+jmp -121
+acc +0
+jmp -74
+jmp +1
+acc +27
+acc +2
+jmp -279
+acc +7
+acc +0
+jmp +1
+jmp -413
+acc +6
+jmp -180
+acc +18
+acc +10
+jmp -437
+jmp -338
+nop -456
+jmp -463
+acc +1
+nop -54
+jmp -168
+acc +27
+jmp -479
+acc +42
+jmp -408
+jmp +85
+acc -16
+acc +24
+jmp -391
+jmp -206
+nop +8
+jmp +1
+acc +38
+nop -473
+jmp -94
+acc +10
+acc -14
+jmp -425
+acc +17
+nop -208
+acc +39
+jmp -265
+acc +3
+jmp -284
+acc +19
+acc +5
+nop -111
+acc +22
+jmp -309
+acc +12
+acc +39
+jmp -151
+acc +33
+acc -14
+jmp -450
+acc +16
+nop +50
+jmp -188
+acc -13
+acc +15
+acc +4
+jmp -484
+acc +27
+jmp -98
+acc +34
+jmp -120
+jmp -537
+acc +43
+acc -8
+acc -6
+jmp -405
+acc -8
+nop -179
+acc -11
+jmp -264
+acc +24
+jmp -280
+acc -6
+acc +1
+jmp -353
+acc -18
+jmp -58
+acc +1
+acc -7
+acc -2
+acc +44
+jmp -115
+nop -328
+acc +27
+acc +2
+jmp +20
+acc +14
+acc +34
+jmp -460
+nop -445
+acc -9
+acc +24
+acc -11
+jmp -72
+jmp -434
+jmp -370
+acc +35
+acc +43
+acc +45
+acc +44
+jmp -287
+jmp -546
+nop -474
+acc -6
+jmp -357
+nop -163
+nop -218
+nop -342
+jmp -570
+acc +44
+acc +4
+acc +35
+acc +6
+jmp -541
+jmp -274
+acc +48
+acc -18
+jmp -171
+acc -13
+acc -14
+acc +25
+acc +26
+jmp +1
diff --git a/solutions/8/python/main.py b/solutions/8/python/main.py
new file mode 100644
index 0000000..b12b270
--- /dev/null
+++ b/solutions/8/python/main.py
@@ -0,0 +1,63 @@
+from os.path import join, dirname
+from typing import List, Optional, Set, Tuple
+
+Instructions = List[Tuple[str, int]]
+
+
+class VM:
+    def __init__(self, code: str) -> None:
+        instructionsRaw = code.strip().split('\n')
+        self.acc = 0
+        self.oc = 0
+        self.invert: Optional[int] = None
+        self.instructions: Instructions = []
+        for instruction in instructionsRaw:
+            op, value = instruction.split(' ')
+            self.instructions.append((op, int(value)))
+
+    def reset(self):
+        self.acc = 0
+        self.oc = 0
+
+    def exec(self):
+        op, value = self.instructions[self.oc]
+        if self.oc == self.invert:
+            op = 'jmp' if op == 'nop' else 'nop'
+        if op == 'nop':
+            self.oc += 1
+        elif op == 'acc':
+            self.acc += value
+            self.oc += 1
+        elif op == 'jmp':
+            self.oc += value
+
+    def run(self) -> Tuple[int, bool]:
+        self.reset()
+        already_visited: Set[int] = set()
+        m = len(self.instructions)
+        while True:
+            if self.oc in already_visited:
+                return (self.acc, True)
+            if not self.oc < m:
+                return (self.acc, False)
+            already_visited.add(self.oc)
+            self.exec()
+
+    def fix(self):
+        for i, instruction in enumerate(self.instructions):
+            op, _ = instruction
+            if op == 'nop' or op == 'jmp':
+                self.invert = i
+                acc, error = self.run()
+                if not error:
+                    return acc
+
+
+data = join(dirname(__file__), '../data.txt')
+with open(data) as f:
+    vm = VM(f.read())
+
+    acc, err = vm.run()
+    print(acc)
+
+    print(vm.fix())
diff --git a/solutions/8/test.txt b/solutions/8/test.txt
new file mode 100644
index 0000000..6fee349
--- /dev/null
+++ b/solutions/8/test.txt
@@ -0,0 +1,9 @@
+nop +0
+acc +1
+jmp +4
+acc +3
+jmp -3
+acc -99
+acc +1
+jmp -4
+acc +6
\ No newline at end of file