add day 4

2022/src/day4/example.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

2022/src/day4/solution.py

@@ -0,0 +1,46 @@
+def get_sections_boundaries(sections: str) -> tuple[int, int]:
+    split = sections.split("-")
+    return int(split[0]), int(split[1])
+
+
+def parse_input(lines: list[str]) -> list[tuple[tuple[int, int], tuple[int, int]]]:
+    output = []
+    for line in lines:
+        stripped = line.strip()
+        if not stripped.isspace():
+            split = stripped.split(",")
+            output.append(
+                (get_sections_boundaries(split[0]), get_sections_boundaries(split[1]))
+            )
+    return output
+
+
+def contained(sections1: tuple[int, int], sections2: tuple[int, int]) -> bool:
+    section1_contains_section2 = (
+        sections1[0] <= sections2[0] and sections1[1] >= sections2[1]
+    )
+    section2_contains_section1 = (
+        sections2[0] <= sections1[0] and sections2[1] >= sections1[1]
+    )
+    return section1_contains_section2 or section2_contains_section1
+
+
+def overlaps(sections1: tuple[int, int], sections2: tuple[int, int]) -> bool:
+    sections1_overlaps_section2 = sections2[0] <= sections1[1] <= sections2[1]
+    sections2_overlaps_section1 = sections1[0] <= sections2[1] <= sections1[1]
+    return sections1_overlaps_section2 or sections2_overlaps_section1
+
+
+def part1(lines: list[str]) -> int:
+    return sum(contained(*sections) for sections in parse_input(lines))
+
+
+def part2(lines: list[str]) -> int:
+    return sum(overlaps(*sections) for sections in parse_input(lines))
+
+
+if __name__ == "__main__":
+    with open("input.txt") as file:
+        contents = file.readlines()
+    print(f"Solution for part 1 is: {part1(contents)}")
+    print(f"Solution for part 2 is: {part2(contents)}")