last lab

labPython/lab20/maze.txt

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+   M    
+        
+M M    M
+  M M M 
+M  M   M
+   MM   
+MMM MMMM
+        

labPython/lab20/task_1.py

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+import random
+
+
+def create_file():
+    n = random.randint(5, 10)
+    maze = []
+    for _ in range(n):
+        row = "".join(["M" if random.random() < 0.3 else " " for _ in range(n)])
+        maze.append(row)
+    with open("maze.txt", "w") as f:
+        for row in maze:
+            f.write(row + "\n")
+    return n
+
+
+def read_maze():
+    with open("maze.txt") as f:
+        maze = [list(line.rstrip("\n")) for line in f]
+    return maze
+
+
+def solve(maze, x, y, xc, yc, visited, length, best):
+    n = len(maze)
+    if x < 0 or y < 0 or x >= n or y >= n:
+        return
+    if maze[x][y] == "M" or visited[x][y]:
+        return
+    if length >= best[0]:
+        return
+    if x == xc and y == yc:
+        best[0] = min(best[0], length)
+        return
+    visited[x][y] = True
+    solve(maze, x + 1, y, xc, yc, visited, length + 1, best)
+    solve(maze, x - 1, y, xc, yc, visited, length + 1, best)
+    solve(maze, x, y + 1, xc, yc, visited, length + 1, best)
+    solve(maze, x, y - 1, xc, yc, visited, length + 1, best)
+    visited[x][y] = False
+
+
+while True:
+    print("\n1 - создать лабиринт\n2 - решить\n0 - выход")
+    try:
+        c = input("Выбор: ")
+        if c == "1":
+            n = create_file()
+            print("Файл создан. Размер:", n)
+        elif c == "2":
+            maze = read_maze()
+            n = len(maze)
+            x = int(input("Старт X: "))
+            y = int(input("Старт Y: "))
+            xc = int(input("Сыр X: "))
+            yc = int(input("Сыр Y: "))
+            visited = [[False] * n for _ in range(n)]
+            best = [10**9]
+            solve(maze, x, y, xc, yc, visited, 0, best)
+            if best[0] == 10**9:
+                print("Путь не найден")
+            else:
+                print("Кратчайший путь:", best[0])
+        elif c == "0":
+            break
+    except:
+        print("Ошибка ввода")

labPython/lab20/task_2.py

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+print("task: 6r\nВставка + и - между цифрами для получения числа N")
+
+
+def generate(s, pos, expr, target, results):
+    if pos == len(s):
+        try:
+            if eval(expr) == target:
+                results.append(expr + "=" + str(target))
+        except:
+            pass
+        return
+    generate(s, pos + 1, expr + "+" + s[pos], target, results)
+    generate(s, pos + 1, expr + "-" + s[pos], target, results)
+    generate(s, pos + 1, expr + s[pos], target, results)
+
+
+while True:
+    print("\n1 - решить\n0 - выход")
+    try:
+        c = input("Выбор: ")
+        if c == "1":
+            s, target = input("Введите число и N: ").split()
+            target = int(target)
+            results = []
+            generate(s, 1, s[0], target, results)
+            with open("result.txt", "w") as f:
+                if results:
+                    for r in results:
+                        print(r)
+                        f.write(r + "\n")
+                else:
+                    print("Решение не существует")
+                    f.write("Решение не существует")
+        elif c == "0":
+            break
+    except:
+        print("Ошибка ввода")