[Silver II] Title: Pancake Deque, Time: 1592 ms, Memory: 232868 KB, S…

…core: 25 point -BaekjoonHub

백준/Silver/25096. Pancake Deque/Pancake Deque.py

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+import sys
+input = sys.stdin.readline
+from collections import deque
+
+def max_paying_customers(T, test_cases):
+    results = []
+    for case_number in range(1, T + 1):
+        N, pancakes = test_cases[case_number - 1]
+        dq = deque(pancakes)
+
+        max_deliciousness = -1
+        paying_customers = 0
+
+        while dq:
+            if dq[0] <= dq[-1]:
+                pancake = dq.popleft()
+            else:
+                pancake = dq.pop()
+
+            if pancake >= max_deliciousness:
+                paying_customers += 1
+                max_deliciousness = pancake
+
+        results.append(f"Case #{case_number}: {paying_customers}")
+
+    return results
+
+t = int(input().strip())
+test_cases = []
+
+for _ in range(t):
+    n = int(input().strip())
+    pancakes = list(map(int, input().strip().split()))
+    test_cases.append((n, pancakes))
+
+results = max_paying_customers(t, test_cases)
+for result in results:
+    print(result)

백준/Silver/25096. Pancake Deque/README.md

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+# [Silver II] Pancake Deque - 25096 
+
+[문제 링크](https://www.acmicpc.net/problem/25096) 
+
+### 성능 요약
+
+메모리: 232868 KB, 시간: 1592 ms
+
+### 분류
+
+자료 구조, 덱, 그리디 알고리즘
+
+### 제출 일자
+
+2024년 7월 9일 12:04:50
+
+### 문제 설명
+
+<p>Pancakes are normally served in stacks, but the Infinite House of Pancakes embraces change! The restaurant's new advertising hook is to serve the pancakes from a deque, or double-ended queue.</p>
+
+<p>You are a server at the restaurant, and your job is to serve every pancake in the deque. Customers will arrive one at a time, and each one gets a single pancake. You must serve each customer either the leftmost or rightmost pancake in the deque; the choice is yours. When a pancake is served, it disappears from the deque, exposing the pancake that was next to it. Or, once there is only one pancake left, your only choice is to serve that one, and then your job is complete!</p>
+
+<p style="text-align: center;"><img alt="" src="" style="width: 471px; height: 115px;"></p>
+
+<p>Each pancake has a deliciousness level. Because customers do not get to choose which pancakes they get, each customer only has to pay for their pancake if it is at least as delicious as <i>each</i> of the pancakes that <i>all</i> of the previous customers got. (The first customer always pays for their pancake, since in that case there are no previous customers.)</p>
+
+<p>How many customers will pay for their pancake, if you serve the pancakes in an order that maximizes that number?</p>
+
+### 입력 
+
+ <p>The first line of the input gives the number of test cases, <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container>. <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container> test cases follow. Each test case is described with two lines. The first line of a test case contains a single integer <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D441 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$N$</span></mjx-container>, the number of pancakes in the pancake deque. The second line of a test case contains <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D441 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$N$</span></mjx-container> integers <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-msub><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D437 TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: -0.15em;"><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-script></mjx-msub><mjx-mo class="mjx-n"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-msub space="2"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D437 TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: -0.15em;"><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c32"></mjx-c></mjx-mn></mjx-script></mjx-msub><mjx-mo class="mjx-n"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c2026"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-msub space="2"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D437 TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: -0.15em;"><mjx-mi class="mjx-i" size="s"><mjx-c class="mjx-c1D441 TEX-I"></mjx-c></mjx-mi></mjx-script></mjx-msub></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>D</mi><mn>1</mn></msub><mo>,</mo><msub><mi>D</mi><mn>2</mn></msub><mo>,</mo><mo>…</mo><mo>,</mo><msub><mi>D</mi><mi>N</mi></msub></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$D_1,D_2,\dots,D_N$</span></mjx-container>, where <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-msub><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D437 TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: -0.15em;"><mjx-mi class="mjx-i" size="s"><mjx-c class="mjx-c1D456 TEX-I"></mjx-c></mjx-mi></mjx-script></mjx-msub></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>D</mi><mi>i</mi></msub></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$D_i$</span></mjx-container> is the deliciousness level of the <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D456 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>i</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$i$</span></mjx-container>-th pancake from the left in the deque.</p>
+
+### 출력 
+
+ <p>For each test case, output one line containing <code>Case #x: y</code>, where <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D465 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$x$</span></mjx-container> is the test case number (starting from 1) and <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D466 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>y</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$y$</span></mjx-container> is the number of customers who pay for their pancakes, if you serve the pancakes in an order that maximizes that number.</p>
+