1 files changed, 133 insertions, 0 deletions
diff --git a/solutions/py/07.py b/solutions/py/07.py
new file mode 100644
index 0000000..2fffe3f
--- /dev/null
+++ b/solutions/py/07.py
@@ -0,0 +1,133 @@
+import itertools
+import queue
+import sys
+
+params = {1:3, 2:3, 3:1, 4:1, 5:2, 6:2, 7:3, 8:3, 99:0}
+ADD = 1
+MULT = 2
+IN = 3
+OUT = 4
+JNZ = 5
+JEZ = 6
+LET = 7
+EQV = 8
+HAL = 99
+
+class Computer(object):
+    def __init__(self, program):
+        self.memory = program.copy()
+        self.pointer = 0
+        self.phase_read = False
+
+        self.input = None
+        self.output = None
+
+    def parse_op(self, op):
+        code = op % 100
+        return [code] + [(op // 10**(i+2)) % 10**(i+1) for i in range(params[code])]
+
+    def clear_flags(self):
+        self.input  = None
+        self.output = None
+
+    def get_param(self, inst, num):
+        return self.memory[self.pointer + num] if inst[num] == True else\
+                self.memory[self.memory[self.pointer + num]]
+
+    def step(self):
+        inst = self.parse_op(self.memory[self.pointer])
+        if inst[0] == HAL:
+            return
+        elif inst[0] == ADD:
+            self.memory[self.memory[self.pointer+3]] = \
+                    self.get_param(inst, 1) + self.get_param(inst, 2)
+            self.pointer += 4
+        elif inst[0] == MULT:
+            self.memory[self.memory[self.pointer+3]] = \
+                    self.get_param(inst, 1) * self.get_param(inst, 2)
+            self.pointer += 4
+        elif inst[0] == IN:
+            self.memory[self.memory[self.pointer+1]] = self.input
+            self.input = None
+            self.pointer += 2
+        elif inst[0] == OUT:
+            self.output = self.get_param(inst, 1)
+            self.pointer += 2
+        elif inst[0] == JNZ:
+            if self.get_param(inst, 1) != 0:
+                self.pointer = self.get_param(inst, 2)
+            else:
+                self.pointer += 3
+        elif inst[0] == JEZ:
+            if self.get_param(inst, 1) == 0:
+                self.pointer = self.get_param(inst, 2)
+            else:
+                self.pointer += 3
+        elif inst[0] == LET:
+            self.memory[self.memory[self.pointer+3]] = 1 if \
+                    self.get_param(inst, 1) < self.get_param(inst, 2) \
+                    else 0
+            self.pointer += 4
+        elif inst[0] == EQV:
+            self.memory[self.memory[self.pointer+3]] = 1 if \
+                    self.get_param(inst, 1) == self.get_param(inst, 2) \
+                    else 0
+            self.pointer += 4
+        else:
+            print(self.memory)
+            print(self.pointer)
+            print("invalid instruction", self.memory[self.pointer])
+            print(inst)
+            sys.exit()
+
+def pt2(program):
+    highest_signal = 0
+    highest_sequence = None
+    for phase_seq in list(itertools.permutations(list(range(5,10)))):
+        signal = 0
+        q = queue.Queue(5)
+        for phase in phase_seq:
+            q.put(phase)
+        amps = [Computer(program) for i in range(5)]
+        for amp in amps:
+            amp.input = q.get()
+
+        signal = 0
+        current_amp = 0
+        while True:
+            amp = amps[current_amp]
+            amp.step()
+            if amp.input == None:
+                if amp.phase_read == False:
+                    amp.phase_read = True
+                    amp.input = signal
+                else:
+                    pass
+            if amp.output is not None:
+                signal = amp.output
+                amp.output = None
+                current_amp = (current_amp + 1) % 5
+                if amps[current_amp].phase_read == True:
+                    amps[current_amp].input = signal
+                continue
+            if amp.memory[amp.pointer] == 99:
+                if current_amp == 4:
+                    break
+                current_amp = (current_amp + 1) % 5
+                amps[current_amp].input = signal
+                continue
+        if signal > highest_signal:
+            highest_signal = signal
+            highest_sequence = phase_seq
+    return highest_signal
+
+if __name__ == "__main__":
+    f = open("../input/07", "r")
+    program = [int(x) for x in f.readline().split(",")]
+
+    import cProfile
+    import timeit
+
+    print(pt2(program))
+    print(timeit.timeit('pt2(program)', globals=globals(), number=1)*1000, "ms")
+    cProfile.run("pt2(program)")