L2-012 關于堆的判斷

def checkHeap(heap, target):if target == 0:return heapif heap[target] < heap[(target - 1) // 2]:temp = heap[target]heap[target] = heap[(target - 1) // 2]heap[(target - 1) // 2] = tempheap = checkHeap(heap, (target - 1) // 2)return heapdef heapInsert(heap, value, _index):heap[_index] = valuereturn checkHeap(heap, _index)n, m = map(int, input().split())
heap = [None for i in range(n)]
values = list(map(int, input().split()))
for i, item in enumerate(values):heap = heapInsert(heap, item, i)
for i in range(m):command_words = input().split()if 'root' in command_words:print('T') if heap[0] == int(command_words[0]) else print('F')elif 'siblings' in command_words:print('T') if ((heap.index(int(command_words[0])) - 1) // 2) == ((heap.index(int(command_words[2])) - 1) // 2) else print('F')elif 'parent' in command_words:print('T') if heap.index(int(command_words[0])) == ((heap.index(int(command_words[-1])) - 1) // 2) else print('F')else:print('T') if heap.index(int(command_words[-1])) == (heap.index(int(command_words[0])) - 1) // 2 else print('F')

L2-013 紅色警報

def find_components(n, edges):visited = [False] * ngraph = [[] for _ in range(n)]for u, v in edges:graph[u].append(v)graph[v].append(u)def dfs(node):stack = [node]while stack:u = stack.pop()for v in graph[u]:if not visited[v]:visited[v] = Truestack.append(v)count = 0for i in range(n):if not visited[i]:count += 1visited[i] = Truedfs(i)return countdef main():import sysinput = sys.stdin.readdata = input().splitlines()n, m = map(int, data[0].split())edges = [list(map(int, data[i].split())) for i in range(1, m + 1)]k = int(data[m + 1])occupied_cities = list(map(int, data[m + 2].split()))# 先計算原始的連通分量數original_components = find_components(n, edges)# 模擬每個城市被攻占lost_cities = set()for i, city in enumerate(occupied_cities):lost_cities.add(city)# 重新構建圖，排除被攻占的城市new_edges = [edge for edge in edges if edge[0] not in lost_cities and edge[1] not in lost_cities]new_components = find_components(n, new_edges)if new_components > original_components:print(f"Red Alert: City {city} is lost!")else:print(f"City {city} is lost.")original_components = new_componentsif len(lost_cities) == n:print("Game Over.")if __name__ == "__main__":main()

L2-015 互評成績

def calculate_final_score(scores, k):final_scores = []for student_scores in scores:student_scores.sort()trimmed_scores = student_scores[1:k-1]  # 去掉最高分和最低分final_score = sum(trimmed_scores) / len(trimmed_scores)final_scores.append(final_score)return final_scoresdef main():N, k, M = map(int, input().split())  # 學生總數、每份作業的評審數、需要輸出的學生數scores = []for _ in range(N):student_scores = list(map(int, input().split()))scores.append(student_scores)final_scores = calculate_final_score(scores, k)final_scores.sort(reverse=True)  # 非遞減順序排序for i in range(M):print("{:.3f}".format(final_scores[i]), end=" ")if __name__ == "__main__":main()

L2-016 愿天下有情人都是失散多年的兄妹

import syssex = {}  # 記錄性別
vec = {}  # 存關系圖def dfs(x, num):  # 從多少號，多少代開始 ,以0開始global flagif num >= 4:returnvec[x] = vec.get(x, [])for i in range(len(vec[x])):vis[vec[x][i]] = vis.get(vec[x][i], 0)if not vis[vec[x][i]]:vis[vec[x][i]] = 1  # 標記出現的人dfs(vec[x][i], num + 1)else:flag = 1  # 是近親returnn = int(sys.stdin.readline())
for i in range(n):num, sexx, dad, mom = sys.stdin.readline().split()sex[num] = sexxvec[num] = vec.get(num, [])if dad != "-1":vec[num].append(dad)sex[dad] = 'M'if mom != "-1":vec[num].append(mom)sex[mom] = "F"
num = int(input())
for i in range(num):person1, person2 = sys.stdin.readline().split()if sex[person1] == sex[person2]:print("Never Mind")else:vis = {}  # 標記是否訪問flag = 0vis[person1] = vis[person2] = 1dfs(person1, 0)dfs(person2, 0)if flag:print("No")else:print("Yes")

L2-017 人以群分 

def sum_range(arr, start, end):return sum(arr[start:end + 1])def main():# 讀取輸入n = int(input())activity_levels = list(map(int, input().split()))# 對活躍度排序activity_levels.sort()# 確定分組if n % 2 == 0:n1 = n2 = n // 2else:n1 = n // 2n2 = n // 2 + 1# 計算活躍度差異sum_outgoing = sum_range(activity_levels, n // 2, n - 1)sum_introverted = sum_range(activity_levels, 0, n // 2 - 1)diff = abs(sum_outgoing - sum_introverted)# 輸出結果print(f"Outgoing #: {n2}")print(f"Introverted #: {n1}")print(f"Diff = {diff}")if __name__ == "__main__":main()

L2-018 多項式A除以B

def display(poly):items = [(exp, coeff) for exp, coeff in sorted(poly.items(), reverse=True) if abs(coeff) >= 0.05]if not items:return "0 0 0.0"result = [str(len(items))] + [f"{exp} {coeff:.1f}" for exp, coeff in items]return ' '.join(result)def parse_input():import sysinput = sys.stdin.read().split()c1, c2 = {}, {}idx = 1m = int(input[0])for _ in range(m):exp = int(input[idx])coeff = float(input[idx + 1])c1[exp] = coeffidx += 2n = int(input[idx])idx += 1for _ in range(n):exp = int(input[idx])coeff = float(input[idx + 1])c2[exp] = coeffidx += 2return c1, c2def polynomial_division(c1, c2):c3 = {}if c1 and c2:max_exp1 = max(c1.keys())max_exp2 = max(c2.keys())while max_exp1 >= max_exp2:if max_exp1 in c1 and abs(c1[max_exp1]) >= 0.05:exp_diff = max_exp1 - max_exp2ratio = c1[max_exp1] / c2[max_exp2]c3[exp_diff] = ratiofor i in c2:exp = exp_diff + ic1[exp] = c1.get(exp, 0) - c2[i] * ratioif abs(c1[exp]) < 0.05:del c1[exp]while max_exp1 in c1 and abs(c1[max_exp1]) < 0.05:del c1[max_exp1]max_exp1 -= 1max_exp1 -= 1return c3, c1def main():c1, c2 = parse_input()c3, c1_remainder = polynomial_division(c1, c2)print(display(c3))print(display(c1_remainder))if __name__ == "__main__":main()

L2-020 功夫傳人

k,z,r = input().split()
k = int(k)
z,r = float(z),float(r)
arr = [0]*k
arr[0] = z
D = [] #用來存儲得道者
c = [[] for i in range(k)]
ant = 0
for i in range(k):b = list(map(int,input().split()))if b[0] != 0:temp = arr[i] - arr[i] * r * 0.01for x in b[1:]:arr[x] = tempc[i].extend(b[1:])else:if arr[i] == 0:for i in range(k):if c[i] != []:for j in c[i]:arr[j] = arr[i] - arr[i] * r * 0.01arr[i] = arr[i] * b[1]ant += arr[i]
print(int(ant))

L2-021 點贊狂魔

def find_top_like_maniacs():N = int(input())  # 從終端接收用戶數like_data = {}for _ in range(N):entry = input()  # 從終端接收每個用戶的點贊數據parts = entry.split()name = parts[0]K = int(parts[1])  # 點贊總次數tags = set(parts[2:])  # 使用集合來存儲不重復的標簽unique_tags_count = len(tags)  # 不重復標簽的數量avg_likes_per_tag = K / unique_tags_count  # 計算點贊平均值like_data[name] = (unique_tags_count, avg_likes_per_tag)# 根據不重復標簽數降序排序，相同情況下根據點贊平均值升序排序sorted_users = sorted(like_data.items(), key=lambda x: (-x[1][0], x[1][1]))# 提取前三名用戶，如果不足三人用'-'填充top_three = [user[0] for user in sorted_users[:3]]while len(top_three) < 3:top_three.append('-')# 輸出結果print(' '.join(top_three))# 調用函數執行
find_top_like_maniacs()

L2-022 重排鏈表

def read_input():first_address, n = input().split()n = int(n)nodes = {}for _ in range(n):address, key, next_address = input().split()nodes[address] = {'key': int(key), 'next': next_address}return first_address, nodesdef remove_duplicates(first_address, nodes):current_address = first_addressunique_values = set()removed_nodes = {}prev_address = Noneunique_list = Nonewhile current_address != "-1":node = nodes[current_address]abs_key = abs(node['key'])if abs_key in unique_values:# Move node to removed listremoved_nodes[current_address] = nodeif prev_address:nodes[prev_address]['next'] = node['next']else:unique_values.add(abs_key)if unique_list is None:unique_list = current_addressprev_address = current_addresscurrent_address = node['next']return unique_list, removed_nodesdef print_list(start_address, nodes):current_address = start_addresswhile current_address != "-1":node = nodes[current_address]next_address = node['next']print(f"{current_address} {node['key']} {next_address}")current_address = next_addressdef main():first_address, nodes = read_input()unique_list_start, removed_nodes = remove_duplicates(first_address, nodes)print_list(unique_list_start, nodes)if removed_nodes:for address, node in removed_nodes.items():node['next'] = "-1"removed_list_start = list(removed_nodes.keys())[0]current_address = removed_list_startwhile True:next_address = removed_nodes[current_address]['next']if next_address == "-1":breakcurrent_address = next_addressprint_list(removed_list_start, removed_nodes)if __name__ == "__main__":main()

L2-023 圖著色問題

def is_valid_coloring(V, edges, coloring):for u, v in edges:if coloring[u - 1] == coloring[v - 1]:return Falsereturn Truedef main():import sysinput = sys.stdin.readdata = input().split()index = 0V = int(data[index])E = int(data[index + 1])K = int(data[index + 2])index += 3edges = []for _ in range(E):u = int(data[index])v = int(data[index + 1])edges.append((u, v))index += 2N = int(data[index])index += 1results = []for _ in range(N):coloring = list(map(int, data[index:index + V]))index += Vif is_valid_coloring(V, edges, coloring):results.append("Yes")else:results.append("No")for result in results:print(result)if __name__ == "__main__":main()

L2-026 小字輩

def main():n = int(input())father = list(map(int, input().split()))generations = [0] * (n+1)min_generation = float('inf')# 計算每個成員到老祖宗的輩分for i in range(1, n+1):if father[i-1] == -1:generations[i] = 1else:generations[i] = generations[father[i-1]] + 1min_generation = min(min_generation, generations[i])# 找到擁有最小輩分的成員編號min_generation_members = [i for i in range(1, n+1) if generations[i] == min_generation]# 輸出結果print(min_generation)print(' '.join(map(str, min_generation_members)))if __name__ == "__main__":main()

L2-032 彩虹瓶

def can_complete_task(n, m, shipment):stack = []  # 臨時貨架，使用列表模擬棧next_color = 1  # 下一個需要裝填的彩球顏色for color in shipment:if color == next_color:next_color += 1# 檢查棧頂是否有連續可以裝填的顏色while stack and stack[-1] == next_color:stack.pop()next_color += 1else:# 放置到棧上stack.append(color)# 檢查棧是否超出了容量if len(stack) > m:return "NO"# 檢查是否所有顏色都已裝填if next_color - 1 == n:return "YES"else:return "NO"# 輸入處理部分
import sysinput = sys.stdin.read
data = input().split()
n, m, k = map(int, data[:3])
results = []# 對每一個發貨順序進行檢查
index = 3
for _ in range(k):shipment = list(map(int, data[index:index + n]))index += nresult = can_complete_task(n, m, shipment)results.append(result)# 輸出結果
for result in results:print(result)

L2-033 簡單計算器

def calculator(N, numbers, operators):stack_numbers = []stack_operators = []# Push numbers and operators to respective stacksfor num in numbers:stack_numbers.append(num)for op in operators:stack_operators.append(op)while stack_operators:if len(stack_numbers) < 2:breakn1 = stack_numbers.pop()n2 = stack_numbers.pop()op = stack_operators.pop()if op == '+':result = n2 + n1elif op == '-':result = n2 - n1elif op == '*':result = n2 * n1elif op == '/':if n1 == 0:print(f"ERROR: {n2}/0")returnresult = n2 // n1  # Use integer divisionelse:raise ValueError(f"Unknown operator: {op}")stack_numbers.append(result)if len(stack_numbers) == 1:print(stack_numbers[0])else:raise ValueError("Invalid computation process")# Read input
import sysinput = sys.stdin.read
data = input().split()N = int(data[0])
numbers = list(map(int, data[1:N + 1]))
operators = data[N + 1:N + N]# Execute the calculator function
calculator(N, numbers, operators)

L2-035 完全二叉樹的層序遍歷 

class TreeNode:def __init__(self, x):self.val = xself.left = Noneself.right = Nonedef build_tree(postorder, start, end, total_nodes):if start > end:return None# 后序遍歷的最后一個節點是根節點root_val = postorder[end]root = TreeNode(root_val)if start == end:return root# 確定完全二叉樹最后一層的節點數levels_full = 0count = 1while count * 2 - 1 < total_nodes:levels_full += 1count *= 2# 最后一層之前的所有節點數last_full_level_count = count // 2 - 1# 最后一層的節點數last_level_count = total_nodes - (count - 1)left_size = min(end - start, last_full_level_count)if last_level_count > count // 2:left_size = last_full_level_count + count // 2else:left_size = last_full_level_count + last_level_count# 遞歸構建左子樹和右子樹root.left = build_tree(postorder, start, start + left_size - 1, left_size)root.right = build_tree(postorder, start + left_size, end - 1, total_nodes - left_size - 1)return rootdef level_order_traversal(root):if not root:return []from collections import dequequeue = deque([root])result = []while queue:node = queue.popleft()result.append(node.val)if node.left:queue.append(node.left)if node.right:queue.append(node.right)return resultdef main():node_count = int(input())postorder = list(map(int, input().split()))if node_count == 0:print("")return# 構建樹root = build_tree(postorder, 0, node_count - 1, node_count)# 層序遍歷result = level_order_traversal(root)# 輸出結果print(" ".join(map(str, result)))if __name__ == '__main__':main()

L3-001 湊零錢

def dfs(coins, current_sum, index, path, results, used):if current_sum > M:returnif current_sum == M:results.append(path.copy())returnfor i in range(index, len(coins)):if not used[i]:used[i] = Truepath.append(coins[i])dfs(coins, current_sum + coins[i], i + 1, path, results, used)path.pop()used[i] = Falseif results:returndef solve():global MN, M = map(int, input().split())coins = list(map(int, input().split()))coins.sort()if sum(coins) < M:print("No Solution")returnresults = []used = [False] * Ndfs(coins, 0, 0, [], results, used)if not results:print("No Solution")else:print(" ".join(map(str, results[0])))solve()

L3-002 特殊堆棧

import sys
import bisectdef main():n = int(sys.stdin.readline().strip())stack = []sorted_keys = []def push(key):stack.append(key)bisect.insort(sorted_keys, key)def pop():if not stack:return "Invalid"top = stack.pop()idx = bisect.bisect_left(sorted_keys, top)sorted_keys.pop(idx)return topdef peek_median():if not stack:return "Invalid"median_index = (len(sorted_keys) - 1) // 2return sorted_keys[median_index]for _ in range(n):command = sys.stdin.readline().strip().split()if command[0] == "Push":push(int(command[1]))elif command[0] == "Pop":print(pop())elif command[0] == "PeekMedian":print(peek_median())if __name__ == "__main__":main()

L3-006 迎風一刀斬

def normalize_polygon(vertices):# 找到最左下的頂點，并根據這個頂點重新排序頂點，以確保逆時針方向start = min(range(len(vertices)), key=lambda i: (vertices[i][1], vertices[i][0]))sorted_vertices = vertices[start:] + vertices[:start]if (sorted_vertices[1][0] - sorted_vertices[0][0]) * (sorted_vertices[2][1] - sorted_vertices[0][1]) < (sorted_vertices[2][0] - sorted_vertices[0][0]) * (sorted_vertices[1][1] - sorted_vertices[0][1]):sorted_vertices = list(reversed(sorted_vertices))return sorted_verticesdef rotate_polygon(vertices, angle):# 旋轉多邊形頂點，angle是90度的倍數if angle == 90:return [(v[1], -v[0]) for v in vertices]elif angle == 180:return [(-v[0], -v[1]) for v in vertices]elif angle == 270:return [(-v[1], v[0]) for v in vertices]return verticesdef reflect_polygon(vertices):# 鏡像多邊形頂點return [(-v[0], v[1]) for v in vertices]def translate_to_origin(vertices):# 將多邊形平移到原點min_x = min(v[0] for v in vertices)min_y = min(v[1] for v in vertices)return [(v[0] - min_x, v[1] - min_y) for v in vertices]def polygon_transforms(vertices):# 生成所有變換transformations = []for angle in [0, 90, 180, 270]:rotated = rotate_polygon(vertices, angle)transformations.append(translate_to_origin(rotated))reflected = reflect_polygon(rotated)transformations.append(translate_to_origin(reflected))return transformationsdef match_polygons(p1, p2):# 檢查兩個多邊形是否可以匹配p1_transforms = polygon_transforms(p1)p2_transforms = polygon_transforms(p2)return any(t1 == t2 for t1 in p1_transforms for t2 in p2_transforms)# 輸入和處理邏輯
n = int(input())
results = []
for _ in range(n):k1, *coords1 = map(int, input().split())p1 = [(coords1[i], coords1[i+1]) for i in range(0, 2*k1, 2)]k2, *coords2 = map(int, input().split())p2 = [(coords2[i], coords2[i+1]) for i in range(0, 2*k2, 2)]p1 = normalize_polygon(p1)p2 = normalize_polygon(p2)if match_polygons(p1, p2):results.append("YES")else:results.append("NO")for result in results:print(result)

L3-007 天梯地圖

def floyd_warshall(graph):n = len(graph)dist = [[float('inf')] * n for _ in range(n)]next_node = [[-1] * n for _ in range(n)] # to store next node in shortest pathfor i in range(n):dist[i][i] = 0for u in range(n):for v, d in graph[u]:dist[u][v] = dnext_node[u][v] = vfor k in range(n):for i in range(n):for j in range(n):if dist[i][k] + dist[k][j] < dist[i][j]:dist[i][j] = dist[i][k] + dist[k][j]next_node[i][j] = next_node[i][k]return dist, next_nodedef get_shortest_path(next_node, start, end):path = []while start != end:path.append(start)start = next_node[start][end]path.append(end)return pathdef main():N, M = map(int, input().split())graph = [[] for _ in range(N)]for _ in range(M):V1, V2, one_way, length, time = map(int, input().split())graph[V1].append((V2, time))if not one_way:graph[V2].append((V1, time))start, end = map(int, input().split())dist, next_node = floyd_warshall(graph)fastest_time = dist[start][end]shortest_path_time = fastest_timeshortest_path = get_shortest_path(next_node, start, end)shortest_distance = float('inf')for i in range(N):if i != start and i != end:shortest_distance = min(shortest_distance, dist[start][i] + dist[i][end])fastest_time_path = get_shortest_path(next_node, start, end)print("Time = {}: {}".format(fastest_time, ' => '.join(map(str, fastest_time_path))))print("Distance = {}: {}".format(shortest_distance, ' => '.join(map(str, shortest_path))))if __name__ == "__main__":main()

L3-008 喊山

def find_farthest_mountain(n, m, k, edges, queries):# 構建山頭之間的連接關系字典connections = {}for edge in edges:a, b = edgeif a not in connections:connections[a] = []if b not in connections:connections[b] = []connections[a].append(b)connections[b].append(a)# 定義深度優先搜索函數def dfs(node, visited):visited.add(node)farthest = nodefor neighbor in connections.get(node, []):if neighbor not in visited:farthest = max(farthest, dfs(neighbor, visited))return farthest# 遍歷查詢列表，找出每個查詢的最遠連鎖山頭result = []for query in queries:if query in connections:farthest_mountain = dfs(query, set())else:farthest_mountain = 0result.append(farthest_mountain)return result# 讀取輸入
n, m, k = map(int, input().split())
edges = [tuple(map(int, input().split())) for _ in range(m)]
queries = list(map(int, input().split()))# 調用函數并輸出結果
result = find_farthest_mountain(n, m, k, edges, queries)
for res in result:print(res)

L3-010 是否完全二叉搜索樹

tree = [0] * (1 << 20)
height = [0] * (1 << 20)def BST(a, num):global treeif tree[a] == 0:tree[a] = numelif tree[a] < num:BST(a * 2, num)else:BST((a << 1) + 1, num)def isComplete(a, h, index, n):if a >= len(tree) or tree[a] == 0:return Trueif index >= n:return Falseleft_complete = isComplete(a * 2, h + 1, index * 2 + 1, n)right_complete = isComplete((a << 1) + 1, h + 1, index * 2 + 2, n)if not left_complete or not right_complete:return Falsereturn Truedef levelOrderTraversal(a):queue = [a]result = []while queue:current = queue.pop(0)if tree[current] != 0:result.append(tree[current])queue.extend([current * 2, (current << 1) + 1])return ' '.join(map(str, result))def main():global heightn = int(input())nums = list(map(int, input().split()))for num in nums:BST(1, num)# 計算樹的高度height[1] = 1for i in range(1, len(height)):if tree[i] != 0:if i * 2 < len(height):height[i * 2] = height[i] + 1if (i << 1) + 1 < len(height):height[(i << 1) + 1] = height[i] + 1# 判斷是否完全二叉樹并進行層序遍歷flag = isComplete(1, 1, 0, n)traversal_result = levelOrderTraversal(1)print(traversal_result)if flag:print("YES")else:print("NO")if __name__ == "__main__":main()

L4-302 拼題A打卡獎勵

def max_coins(n, m, times, coins):# 貪心預處理：按單位時間的金幣價值降序排序items = sorted(zip(times, coins), key=lambda x: -x[1] / x[0])# 初始化DP數組dp = [0] * (m + 1)# 遍歷打卡卷（已排序）for time, coin in items:# 從后往前更新DP數組for j in range(m, time - 1, -1):dp[j] = max(dp[j], dp[j - time] + coin)return dp[m]# 輸入處理部分
n, m = map(int, input().strip().split())
times = list(map(int, input().strip().split()))
coins = list(map(int, input().strip().split()))# 計算最大金幣數并輸出
result = max_coins(n, m, times, coins)
print(result)

L4-202 二叉搜索樹的2層結點統計

class TreeNode:def __init__(self, key):self.left = Noneself.right = Noneself.value = keydef insert(root, key):if root is None:return TreeNode(key)else:if root.value < key:root.right = insert(root.right, key)else:root.left = insert(root.left, key)return rootdef count_last_two_levels(root):if not root:return 0from collections import dequequeue = deque([root])level_count = []while queue:level_size = len(queue)current_level = []for _ in range(level_size):node = queue.popleft()current_level.append(node)if node.left:queue.append(node.left)if node.right:queue.append(node.right)level_count.append(len(current_level))if len(level_count) == 1:return level_count[0]else:return level_count[-1] + level_count[-2]def main():import sysinput = sys.stdin.readdata = input().split()N = int(data[0])numbers = list(map(int, data[1:N + 1]))root = Nonefor number in numbers:root = insert(root, number)result = count_last_two_levels(root)print(result)if __name__ == "__main__":main()

L4-201 出棧序列的合法性

def is_valid_sequence(m, n, sequence):stack = []current = 0  # 當前需要入棧的數字，初始化為0，表示還未開始入棧for num in sequence:if current < num:  # 如果當前需要的數字小于目標數字# 需要將 current+1 到 num 入棧while current < num:if len(stack) < m:  # 檢查是否超出棧的最大容量current += 1stack.append(current)else:return "NO"if stack and stack[-1] == num:  # 檢查棧頂元素是否為需要出棧的元素stack.pop()  # 出棧else:return "NO"  # 如果棧頂元素不是需要出棧的，那么這個序列不可能return "YES"def process_stack_operations(m, n, k, sequences):results = []for seq in sequences:results.append(is_valid_sequence(m, n, seq))return results# 輸入部分處理
import sys
input = sys.stdin.read
data = input().splitlines()first_line = data[0].split()
m = int(first_line[0])
n = int(first_line[1])
k = int(first_line[2])sequences = []
for i in range(1, k + 1):sequences.append(list(map(int, data[i].split())))# 處理每個序列，輸出結果
results = process_stack_operations(m, n, k, sequences)
for result in results:print(result)

L4-117 矩陣列平移

def is_valid_sequence(sequence):if len(sequence) == 1:return Truefor i in range(len(sequence) - 1):current = sequence[i]next_char = sequence[i + 1]if current.isupper():valid_next_lower = current.lower()valid_next_upper = chr(ord(current) + 1) if current != 'Z' else Noneif not ((next_char == valid_next_lower) or (next_char == valid_next_upper)):return Falseelse:valid_next_upper = current.upper()valid_prev_lower = chr(ord(current) - 1) if current != 'a' else Noneif not ((next_char == valid_next_upper) or (next_char == valid_prev_lower)):return Falsereturn TrueN = int(input())
for _ in range(N):student_sequence = input()print("Y" if is_valid_sequence(student_sequence) else "N")

L4-116 字母串

def is_valid_sequence(sequence):# 如果序列只有一個字符，它是合法的if len(sequence) == 1:return True# 遍歷序列中的每個字符，檢查與下一個字符的關系for i in range(len(sequence) - 1):current = sequence[i]next_char = sequence[i + 1]# 處理大寫字母的情況if current.isupper():if current != 'Z':valid_next_upper = chr(ord(current) + 1)else:valid_next_upper = Nonevalid_next_lower = current.lower()# 檢查下一個字符是否符合規則if next_char != valid_next_lower and next_char != valid_next_upper:return False# 處理小寫字母的情況else:if current != 'a':valid_prev_lower = chr(ord(current) - 1)else:valid_prev_lower = Nonevalid_next_upper = current.upper()# 檢查下一個字符是否符合規則if next_char != valid_next_upper and next_char != valid_prev_lower:return False# 如果所有字符都符合規則，返回 Truereturn True# 讀取輸入和打印輸出
N = int(input())
results = []
for _ in range(N):student_sequence = input()results.append("Y" if is_valid_sequence(student_sequence) else "N")for result in results:print(result)

L4-108 谷歌的招聘

def is_prime(n):""" 檢查整數 n 是否為素數 """if n <= 1:return Falsei = 2while i * i <= n:if n % i == 0:return Falsei += 1return Truedef main():# 通過 input 函數逐行讀取輸入a, b = map(int, input().split())s = input().strip()# 遍歷所有長度為 b 的子串for i in range(a - b + 1):s2 = s[i:i + b]n = int(s2)if is_prime(n):print(s2)return# 如果沒有找到素數print("404")if __name__ == "__main__":main()

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