{ "data": { "question": { "questionId": "1808", "questionFrontendId": "1690", "boundTopicId": null, "title": "Stone Game VII", "titleSlug": "stone-game-vii", "content": "<p>Alice and Bob take turns playing a game, with <strong>Alice starting first</strong>.</p>\n\n<p>There are <code>n</code> stones arranged in a row. On each player's turn, they can <strong>remove</strong> either the leftmost stone or the rightmost stone from the row and receive points equal to the <strong>sum</strong> of the remaining stones' values in the row. The winner is the one with the higher score when there are no stones left to remove.</p>\n\n<p>Bob found that he will always lose this game (poor Bob, he always loses), so he decided to <strong>minimize the score's difference</strong>. Alice's goal is to <strong>maximize the difference</strong> in the score.</p>\n\n<p>Given an array of integers <code>stones</code> where <code>stones[i]</code> represents the value of the <code>i<sup>th</sup></code> stone <strong>from the left</strong>, return <em>the <strong>difference</strong> in Alice and Bob's score if they both play <strong>optimally</strong>.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> stones = [5,3,1,4,2]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> \n- Alice removes 2 and gets 5 + 3 + 1 + 4 = 13 points. Alice = 13, Bob = 0, stones = [5,3,1,4].\n- Bob removes 5 and gets 3 + 1 + 4 = 8 points. Alice = 13, Bob = 8, stones = [3,1,4].\n- Alice removes 3 and gets 1 + 4 = 5 points. Alice = 18, Bob = 8, stones = [1,4].\n- Bob removes 1 and gets 4 points. Alice = 18, Bob = 12, stones = [4].\n- Alice removes 4 and gets 0 points. Alice = 18, Bob = 12, stones = [].\nThe score difference is 18 - 12 = 6.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> stones = [7,90,5,1,100,10,10,2]\n<strong>Output:</strong> 122</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == stones.length</code></li>\n\t<li><code>2 <= n <= 1000</code></li>\n\t<li><code>1 <= stones[i] <= 1000</code></li>\n</ul>\n", "translatedTitle": null, "translatedContent": null, "isPaidOnly": false, "difficulty": "Medium", "likes": 640, "dislikes": 125, "isLiked": null, "similarQuestions": "[{\"title\": \"Stone Game\", \"titleSlug\": \"stone-game\", \"difficulty\": \"Medium\", \"translatedTitle\": null}, {\"title\": \"Stone Game II\", \"titleSlug\": \"stone-game-ii\", \"difficulty\": \"Medium\", \"translatedTitle\": null}, {\"title\": \"Stone Game III\", \"titleSlug\": \"stone-game-iii\", \"difficulty\": \"Hard\", \"translatedTitle\": null}, {\"title\": \"Stone Game IV\", \"titleSlug\": 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"__typename": "CodeSnippetNode" }, { "lang": "C", "langSlug": "c", "code": "\n\nint stoneGameVII(int* stones, int stonesSize){\n\n}", "__typename": "CodeSnippetNode" }, { "lang": "C#", "langSlug": "csharp", "code": "public class Solution {\n public int StoneGameVII(int[] stones) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "JavaScript", "langSlug": "javascript", "code": "/**\n * @param {number[]} stones\n * @return {number}\n */\nvar stoneGameVII = function(stones) {\n \n};", "__typename": "CodeSnippetNode" }, { "lang": "Ruby", "langSlug": "ruby", "code": "# @param {Integer[]} stones\n# @return {Integer}\ndef stone_game_vii(stones)\n \nend", "__typename": "CodeSnippetNode" }, { "lang": "Swift", "langSlug": "swift", "code": "class Solution {\n func stoneGameVII(_ stones: [Int]) -> Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Go", "langSlug": "golang", "code": "func stoneGameVII(stones []int) int {\n \n}", "__typename": "CodeSnippetNode" }, { "lang": "Scala", "langSlug": "scala", "code": "object Solution {\n def stoneGameVII(stones: Array[Int]): Int = {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Kotlin", "langSlug": "kotlin", "code": "class Solution {\n fun stoneGameVII(stones: IntArray): Int {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "Rust", "langSlug": "rust", "code": "impl Solution {\n pub fn stone_game_vii(stones: Vec<i32>) -> i32 {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "PHP", "langSlug": "php", "code": "class Solution {\n\n /**\n * @param Integer[] $stones\n * @return Integer\n */\n function stoneGameVII($stones) {\n \n }\n}", "__typename": "CodeSnippetNode" }, { "lang": "TypeScript", "langSlug": "typescript", "code": "function stoneGameVII(stones: number[]): number {\n\n};", "__typename": "CodeSnippetNode" } ], "stats": "{\"totalAccepted\": \"25.8K\", \"totalSubmission\": \"44K\", \"totalAcceptedRaw\": 25786, \"totalSubmissionRaw\": 43957, \"acRate\": \"58.7%\"}", "hints": [ "The constraints are small enough for an N^2 solution.", "Try using dynamic programming." ], "solution": { "id": "1080", "canSeeDetail": false, "paidOnly": true, "hasVideoSolution": false, "paidOnlyVideo": true, "__typename": "ArticleNode" }, "status": null, "sampleTestCase": "[5,3,1,4,2]", "metaData": "{\n \"name\": \"stoneGameVII\",\n \"params\": [\n {\n \"name\": \"stones\",\n \"type\": \"integer[]\"\n }\n ],\n \"return\": {\n \"type\": \"integer\"\n }\n}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [], "enableRunCode": true, "enableTestMode": false, "enableDebugger": true, "envInfo": "{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 17 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free 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Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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