Add university content

high-school/graphes/maze/fifo.py

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+class Pile:
+    def __init__(self) -> None:
+        self.element = []
+
+    def empiler(self, element) -> None:
+        self.element.append(element)
+
+    def est_vide(self) -> bool:
+        return len(self.element) == 0
+
+    def defiler(self):
+        assert not self.est_vide(), "La pile est vide"
+        return self.element.pop()
+
+    def size(self) -> int:
+        return len(self.element)
+
+    def index(self, k):
+        assert not self.est_vide(), "La pile est vide"
+        return self.element[k]