찬민 책 숙제 (#83)

Author: bsyzch

cmkim/이것이 취업을 위한 코딩 테스트다/경쟁적 전염_344p.py

@@ -0,0 +1,59 @@
+from collections import deque
+import heapq
+
+n, k = map(int, input().split())
+arr = [[]]
+
+temp = []
+q = deque()
+heap = []
+def dfs(count):
+    while q:
+        virus, x, y = q.popleft()
+        for i in range(4):
+            nx, ny = x + dx[i], y + dy[i]
+            if 0 < nx <= n and 0 < ny <= n:
+                if arr[nx][ny] == 0:
+                    arr[nx][ny] = virus
+                    q.append((virus, nx, ny))
+        count -= 1
+
+        if count == 0:
+            return
+
+
+dx = [-1, 1, 0, 0] # 상하좌우
+dy = [0, 0, -1, 1]
+
+for i in range(1, n+1):
+    arr.append(list(map(int, input().split())))
+    arr[i].insert(0, 0)
+    for j in range(n+1):
+        if arr[i][j]:
+            temp.append((arr[i][j], i, j))# 바이러스 종류, 행, 열
+            #heapq.heappush(heap, (arr[i][j], (i, j)))
+            #q.append((arr[i][j], i, j))# 바이러스 종류, 행, 열
+
+
+count = 1
+while True: # 너무 무식하게 넣었는데 더 깔끔한 방법은 없을까?
+    for i in range(len(temp)):
+        if temp[i][0] == count:
+            q.append((temp[i][0], temp[i][1], temp[i][2]))
+    count += 1
+    if count > k:
+        break
+
+
+
+s, x, y = map(int, input().split())
+
+for i in range(s):
+    dfs(len(q))
+
+print(arr[x][y])
+
+
+
+
+

cmkim/이것이 취업을 위한 코딩 테스트다/특정거리의 도시찾기_339p.py

@@ -0,0 +1,40 @@
+from _collections import deque
+
+n, m, k, x = map(int, input().split())
+
+arr = [[] for _ in range(n+1)]
+dist = [1000000000] * (n+1)
+
+for i in range(m):
+    a, b = map(int, input().split())
+    arr[a].append(b)
+    #arr[b].append(a)
+
+q = deque()
+q.append((x, 1))
+
+while q:
+    start, cost = q.popleft()
+
+    for end in arr[start]:
+        dist[end] = min(dist[end], cost)
+        q.append((end, cost+1))
+
+count = 0
+for i in range(1, n+1):
+    if dist[i] == k:
+        print(i)
+        count += 1
+
+if not count:
+    print(-1)
+
+
+
+'''
+4 4 2 1
+1 2 
+1 3
+2 3
+2 4 
+'''