first 3 days

1/1.py

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+def distances(left: list[int], right: list[int]) -> list[int]:
+    left, right = sorted(left), sorted(right)
+    return [abs(l-r) for l, r in zip(left, right)]
+
+if __name__ == '__main__':
+    with open('1.input') as file:
+        left, right = [], []
+        for line in file:
+            l, r = line.split()
+            l, r = int(l), int(r)
+            left.append(l)
+            right.append(r)
+    print(sum(distances(left, right)))

1/2.py

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+def counts(nums: list[int]) -> dict[int, int]:
+    ret = {}
+    for n in nums:
+        if n in ret:
+            ret[n] += 1
+        else:
+            ret[n] = 1
+    return ret
+
+
+if __name__ == '__main__':
+    with open('1.input') as file:
+        left, right = [], []
+        for line in file:
+            l, r = line.split()
+            l, r = int(l), int(r)
+            left.append(l)
+            right.append(r)
+    # how many times does each number apear in each list
+    right = counts(right)
+    score = 0
+    for n in left:
+        if n not in right: continue
+        score += n * right[n]
+    print(score)
+       
+
+    

1/sample.input

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+3   4
+4   3
+2   5
+1   3
+3   9
+3   3