Solve 2016:25 p1 "Clock Signal"

Did brute force, but earlier drafts of the code
failed to exit the while loop correcly.

By manual testing, an odd number is required in reg
a to set the first output to 0 (for my puzzle
input at least). Hence, only odd numbers are tested.

2016-python2/output/day_25.py

@@ -0,0 +1,77 @@
+def solve(data):
+    p = data.splitlines()
+    csl = 30
+    A = "01" * (csl // 2)
+    i = 1
+    while True:
+        if A == run(
+            csl,
+            p.copy(),
+            {
+                "a": i,
+                "b": 0,
+                "c": 0,
+                "d": 0,
+            },
+        ):
+            break
+        i += 2
+    p1 = i
+    return p1, None
+
+
+def run(lO, p, r):
+    i = 0
+    pl = len(p)
+    outs = []
+    while i < pl and len(outs) < lO:
+        o, *a = p[i].split()
+        match o:
+            case "cpy":
+                kv, t = a
+                if t in "abcd":
+                    r[t] = int(kv) if kv not in "abcd" else r[kv]
+                i += 1
+            case "out":
+                kv, *_ = a
+                outs.append(f'{int(kv) if kv not in "abcd" else r[kv]}')
+                i += 1
+            case "jnz":
+                kv, d = a
+                c = int(kv) if kv not in "abcd" else r[kv]
+                d = int(d) if d not in "abcd" else r[d]
+                i += 1 if c == 0 else d
+            case "inc":
+                r[a[0]] += 1
+                i += 1
+            case "dec":
+                r[a[0]] -= 1
+                i += 1
+            case "tgl":
+                kv = a[0]
+                c = int(kv) if kv not in "abcd" else r[kv]
+                if 0 <= i + c < pl:
+                    old, *v = p[i + c].split()
+                    match old:
+                        case "inc":
+                            nw = "dec"
+                        case "dec":
+                            nw = "inc"
+                        case "tgl":
+                            nw = "inc"
+                        case "jnz":
+                            nw = "cpy"
+                        case _:
+                            nw = "jnz"
+                    p[i + c] = " ".join([nw] + v)
+                i += 1
+    return "".join(outs)
+
+
+if __name__ == "__main__":
+    with open("./input/25.txt", "r") as f:
+        inp = f.read().strip()
+
+    p1, p2 = solve(inp)
+
+    print(p1)