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华为OD机试 - 勇攀数字高峰(Python)

  • 2026-06-28 10:42:31
华为OD机试 - 勇攀数字高峰(Python)

解题思路

本题要求从全局最低点出发,每一步只能向上下左右移动,海拔严格递增且高度差不超过给定最大值D,每个格子只能走一次,最终到达全局最高点。求所有满足条件的路径总数。

由于地图最大为10×10,格子数最多100,DFS回溯是可行且直观的方法。下面给出两种实现思路:

思路一:递归DFS + 回溯

  • 找到最低点和最高点的坐标。

  • 从最低点开始递归,尝试四个方向。

  • 使用visited数组标记已走过格子。

  • 当到达最高点时,计数加1。

  • 注意:每一步的海拔必须严格递增且高度差 ≤ D。

  • 时间复杂度:最坏O(4^(n*m)),但实际剪枝后可行。

思路二:迭代DFS(栈模拟回溯)

  • 使用栈保存状态:当前位置、已访问集合(可用位掩码或布尔数组)、当前路径等。

  • 手动模拟递归的回溯过程,避免递归深度过深。

  • 当栈顶元素处理完所有方向后弹出,并恢复访问状态。

  • 同样计数到达终点的路径。

代码实现

思路一:递归DFS

import sysdef solve_dfs_recursive():    data = list(map(int, sys.stdin.read().split()))    if not data:        return    idx = 0    n, m, D = data[idx], data[idx+1], data[idx+2]    idx += 3    grid = []    for i in range(n):        row = data[idx:idx+m]        idx += m        grid.append(row)    # 找到最低点和最高点    min_val = min(min(row) for row in grid)    max_val = max(max(row) for row in grid)    start = end = None    for i in range(n):        for j in range(m):            if grid[i][j] == min_val:                start = (i, j)            if grid[i][j] == max_val:                end = (i, j)    visited = [[False] * m for _ in range(n)]    directions = [(0,1),(1,0),(0,-1),(-1,0)]    count = 0    def dfs(x, y):        nonlocal count        if (x, y) == end:            count += 1            return        for dx, dy in directions:            nx, ny = x + dx, y + dy            if 0 <= nx < n and 0 <= ny < m and not visited[nx][ny]:                diff = grid[nx][ny] - grid[x][y]                if diff > 0 and diff <= D:                    visited[nx][ny] = True                    dfs(nx, ny)                    visited[nx][ny] = False    visited[start[0]][start[1]] = True    dfs(start[0], start[1])    print(count)if __name__ == "__main__":    solve_dfs_recursive()

思路二:迭代DFS(栈模拟)

import sysdef solve_dfs_iterative():    data = list(map(int, sys.stdin.read().split()))    if not data:        return    idx = 0    n, m, D = data[idx], data[idx+1], data[idx+2]    idx += 3    grid = []    for i in range(n):        row = data[idx:idx+m]        idx += m        grid.append(row)    # 找到起点和终点    min_val = min(min(row) for row in grid)    max_val = max(max(row) for row in grid)    start = end = None    for i in range(n):        for j in range(m):            if grid[i][j] == min_val:                start = (i, j)            if grid[i][j] == max_val:                end = (i, j)    directions = [(0,1),(1,0),(0,-1),(-1,0)]    # 栈元素: (x, y, visited_mask, 方向索引)    # 由于n*m<=100,可以用整数位掩码表示visited,但为简单,使用二维布尔数组的元组(不可哈希)    # 改用保存路径列表,回溯时恢复visited    # 另一种方式:栈中保存 (x, y, visited_state, next_dir_index)    # 用list of list记录visited状态,深拷贝开销大,此处用回溯思想模拟递归    # 手动模拟调用栈:    visited = [[False]*m for _ in range(n)]    visited[start[0]][start[1]] = True    # 栈元素: (x, y, 方向索引)    stack = [(start[0], start[1], 0)]    count = 0    # 记录每个位置的邻居迭代状态    # 使用显式栈模拟递归,需要保存当前节点和尝试的下一个方向索引    # 更简单:使用递归但这里要求迭代,给出另一种实现:    # 用栈存储 (x, y, visited_copy) 会超内存,改用path列表和回溯    # 采用手动模拟的方式:    # 我们用一个列表记录当前路径,每次尝试方向,类似DFS迭代器    # 重新设计:使用栈存储 (x, y, step) 并配合手动回溯,但较为复杂。    # 下面提供一种清晰但可能稍慢的实现:使用栈存储状态,每次压入新状态前复制visited(由于格子最多100,复制100*100布尔数组成本可接受)    # 但复制开销较大,不过n,m<=10,路径数量有限,可行。    # 更优雅:使用栈存储 (x, y, visited_tuple) 将visited转为元组,但元组不可变,每次创建新元组。    # 这里采用复制visited列表的方式。    # 再次实现:    visited = [[False]*m for _ in range(n)]    visited[start[0]][start[1]] = True    # 栈元素: (x, y, visited_state)    stack = [(start[0], start[1], [row[:] for row in visited])]    count = 0    while stack:        x, y, vis = stack.pop()        if (x, y) == end:            count += 1            continue        for dx, dy in directions:            nx, ny = x+dx, y+dy            if 0 <= nx < n and 0 <= ny < m and not vis[nx][ny]:                diff = grid[nx][ny] - grid[x][y]                if 0 < diff <= D:                    new_vis = [row[:] for row in vis]                    new_vis[nx][ny] = True                    stack.append((nx, ny, new_vis))    print(count)if __name__ == "__main__":    solve_dfs_iterative()

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  1. CONNECT:[ UseTime:0.000585s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000567s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.015888s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005943s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000694s ]
  6. SELECT * FROM `set` [ RunTime:0.002472s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000628s ]
  8. SELECT * FROM `article` WHERE `id` = 499126 LIMIT 1 [ RunTime:0.006861s ]
  9. UPDATE `article` SET `lasttime` = 1783006111 WHERE `id` = 499126 [ RunTime:0.009430s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000426s ]
  11. SELECT * FROM `article` WHERE `id` < 499126 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002025s ]
  12. SELECT * FROM `article` WHERE `id` > 499126 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007873s ]
  13. SELECT * FROM `article` WHERE `id` < 499126 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.265960s ]
  14. SELECT * FROM `article` WHERE `id` < 499126 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.060699s ]
  15. SELECT * FROM `article` WHERE `id` < 499126 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.031787s ]
0.485454s