From 84d61429569b21c320e568f24dde1d6986990e3c Mon Sep 17 00:00:00 2001
From: shining-ai <tderkkwii+social@gmail.com>
Date: Mon, 10 Jun 2024 14:29:37 +0000
Subject: [PATCH] =?UTF-8?q?=E3=80=90Grind75Hard=E3=80=9111=E5=95=8F?=
 =?UTF-8?q?=E7=9B=AE=20895.=20Maximum=20Frequency=20Stack?=
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---
 .../level_1.py                                | 21 +++++++++++++++++++
 .../level_2.py                                | 21 +++++++++++++++++++
 .../level_3.py                                | 18 ++++++++++++++++
 3 files changed, 60 insertions(+)
 create mode 100644 grind75_hard/11_895. Maximum Frequency Stack/level_1.py
 create mode 100644 grind75_hard/11_895. Maximum Frequency Stack/level_2.py
 create mode 100644 grind75_hard/11_895. Maximum Frequency Stack/level_3.py

diff --git a/grind75_hard/11_895. Maximum Frequency Stack/level_1.py b/grind75_hard/11_895. Maximum Frequency Stack/level_1.py
new file mode 100644
index 0000000..94aacfd
--- /dev/null
+++ b/grind75_hard/11_895. Maximum Frequency Stack/level_1.py	
@@ -0,0 +1,21 @@
+# 回数ごとに違うstackを作る
+class FreqStack:
+
+    def __init__(self):
+        self.freq = defaultdict(int)
+        self.stack = [[]]
+        self.max_freq = 0
+
+    def push(self, val: int) -> None:
+        self.freq[val] += 1
+        if len(self.stack) < self.freq[val]:
+            self.stack.append([])
+        self.max_freq = max(self.max_freq, self.freq[val])
+        self.stack[self.freq[val] - 1].append(val)
+
+    def pop(self) -> int:
+        val = self.stack[self.max_freq - 1].pop()
+        self.freq[val] -= 1
+        if not self.stack[self.max_freq - 1]:
+            self.max_freq -= 1
+        return val
diff --git a/grind75_hard/11_895. Maximum Frequency Stack/level_2.py b/grind75_hard/11_895. Maximum Frequency Stack/level_2.py
new file mode 100644
index 0000000..ac50d5a
--- /dev/null
+++ b/grind75_hard/11_895. Maximum Frequency Stack/level_2.py	
@@ -0,0 +1,21 @@
+# stacksをdefaultdict(list)を使うことで空の場合の確認を不要にした。
+class FreqStack:
+
+    def __init__(self):
+        self.frequency = defaultdict(int)
+        self.stacks = defaultdict(list)
+        self.max_frequency = 0
+
+    def push(self, val: int) -> None:
+        self.frequency[val] += 1
+        self.max_frequency = max(self.max_frequency, self.frequency[val])
+        self.stacks[self.frequency[val]].append(val)
+
+    def pop(self) -> int:
+        if not self.stacks[self.max_frequency]:
+            return None
+        top_value = self.stacks[self.max_frequency].pop()
+        self.frequency[val] -= 1
+        while self.max_frequency != 0 and not self.stacks[self.max_frequency]:
+            self.max_frequency -= 1
+        return top_value
diff --git a/grind75_hard/11_895. Maximum Frequency Stack/level_3.py b/grind75_hard/11_895. Maximum Frequency Stack/level_3.py
new file mode 100644
index 0000000..ed69cda
--- /dev/null
+++ b/grind75_hard/11_895. Maximum Frequency Stack/level_3.py	
@@ -0,0 +1,18 @@
+class FreqStack:
+
+    def __init__(self):
+        self.frequency = defaultdict(int)
+        self.stacks = defaultdict(list)
+        self.max_frequency = 0
+
+    def push(self, val: int) -> None:
+        self.frequency[val] += 1
+        self.stacks[self.frequency[val]].append(val)
+        self.max_frequency = max(self.max_frequency, self.frequency[val])
+
+    def pop(self) -> int:
+        value = self.stacks[self.max_frequency].pop()
+        self.frequency[value] -= 1
+        while self.max_frequency != 0 and not self.stacks[self.max_frequency]:
+            self.max_frequency -= 1
+        return value