feat: add week 09 problems

Author: shinsj4653

linked-list-cycle/shinsj4653.py

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+"""
+[문제풀이]
+# Inputs
+
+# Outputs
+
+# Constraints
+
+# Ideas
+
+[회고]
+
+"""
+
+

maximum-product-subarray/shinsj4653.py

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+"""
+[문제풀이]
+# Inputs
+
+# Outputs
+
+# Constraints
+
+# Ideas
+
+[회고]
+
+"""
+
+

minimum-window-substring/shinsj4653.py

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+"""
+[문제풀이]
+# Inputs
+
+# Outputs
+
+# Constraints
+
+# Ideas
+
+[회고]
+
+"""
+
+

pacific-atlantic-water-flow/shinsj4653.py

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+"""
+[문제풀이]
+# Inputs
+
+# Outputs
+
+# Constraints
+
+# Ideas
+
+[회고]
+
+"""
+
+
+class Solution:
+    def pacificAtlantic(heights):
+        ret = []
+
+        dy = [-1, 0, 1, 0]
+        dx = [0, 1, 0, -1]
+
+        n, m = len(heights), len(heights[0])
+
+        def isPacific(y, x):  # pacific 도달 가능한지
+            if y == 0 or (0 <= y < n and x == 0):
+                return True
+
+            else:
+                return False
+
+        def isAtlantic(y, x):  # Atlantic 도달 가능한지
+            if y == n - 1 or (0 <= y < n and x == m - 1):
+                return True
+
+            else:
+                return False
+
+        def inRange(y, x):
+            if 0 <= y < n and 0 <= x < m:
+                return True
+            else:
+                return False
+
+        v = [[False for _ in range(m)] for _ in range(n)]
+
+        def dfs(y, x, heights, v):
+            if isPacific(y, x) and isAtlantic(y, x):
+                return True
+
+            v[y][x] = True
+
+            for i in range(4):
+                ny, nx = y + dy[i], x + dx[i]
+                if inRange(ny, nx) and not v[ny][nx] and \
+                        heights[y][x] >= heights[ny][nx]:
+                    if dfs(ny, nx, heights, v):
+                        return True
+
+            v[y][x] = False
+            return False
+
+        for i in range(n):
+            for j in range(m):
+                if dfs(i, j, heights, v):
+                    ret.append((i, j))
+
+        return ret
+
+    pacificAtlantic([[1,2,2,3,5],[3,2,3,4,4],[2,4,5,3,1],[6,7,1,4,5],[5,1,1,2,4]])
+

sum-of-two-integers/shinsj4653.py

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+"""
+[문제풀이]
+# Inputs
+
+# Outputs
+
+# Constraints
+
+# Ideas
+
+[회고]
+
+"""
+
+