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"question": {
"questionId": "1000480",
"questionFrontendId": "LCP 63",
"categoryTitle": "Algorithms",
"boundTopicId": 1845922,
"title": "弹珠游戏",
"titleSlug": "EXvqDp",
"content": "",
"translatedTitle": "弹珠游戏",
"translatedContent": "欢迎各位来到「力扣嘉年华」,接下来将为各位介绍在活动中广受好评的弹珠游戏。\n\n`N*M` 大小的弹珠盘的初始状态信息记录于一维字符串型数组 `plate` 中,数组中的每个元素为仅由 `\"O\"`、`\"W\"`、`\"E\"`、`\".\"` 组成的字符串。其中:\n- `\"O\"` 表示弹珠洞(弹珠到达后会落入洞中,并停止前进);\n- `\"W\"` 表示逆时针转向器(弹珠经过时方向将逆时针旋转 90 度);\n- `\"E\"` 表示顺时针转向器(弹珠经过时方向将顺时针旋转 90 度);\n- `\".\"` 表示空白区域(弹珠可通行)。\n\n游戏规则要求仅能在边缘位置的 **空白区域** 处(弹珠盘的四角除外)沿 **与边缘垂直** 的方向打入弹珠,并且打入后的每颗弹珠最多能 **前进** `num` 步。请返回符合上述要求且可以使弹珠最终入洞的所有打入位置。你可以 **按任意顺序** 返回答案。\n\n**注意:**\n- 若弹珠已到达弹珠盘边缘并且仍沿着出界方向继续前进,则将直接出界。\n\n**示例 1**\n> 输入\b\n>`num = 4`\n>`plate = [\"..E.\",\".EOW\",\"..W.\"]`\n> \n> 输出:`[[2,1]]`\n> \n> 解释:\n> 在 `[2,1]` 处打入弹珠,弹珠前进 1 步后遇到转向器,前进方向顺时针旋转 90 度,再前进 1 步进入洞中。\n![b054955158a99167b8d51da0e22a54da.gif](https://pic.leetcode-cn.com/1630392649-BoQncz-b054955158a99167b8d51da0e22a54da.gif){:width=\"300px\"}\n\n**示例 2**\n> 输入\b\n>`num = 5`\n>`plate = [\".....\",\"..E..\",\".WO..\",\".....\"]`\n> \n> 输出:`[[0,1],[1,0],[2,4],[3,2]]`\n> \n> 解释:\n> 在 `[0,1]` 处打入弹珠,弹珠前进 2 步,遇到转向器后前进方向逆时针旋转 90 度,再前进 1 步进入洞中。\n> 在 `[1,0]` 处打入弹珠,弹珠前进 2 步,遇到转向器后前进方向顺时针旋转 90 度,再前进 1 步进入洞中。\n> 在 `[2,4]` 处打入弹珠,弹珠前进 2 步后进入洞中。\n> 在 `[3,2]` 处打入弹珠,弹珠前进 1 步后进入洞中。\n![b44e9963239ae368badf3d00b7563087.gif](https://pic.leetcode-cn.com/1630392625-rckbdy-b44e9963239ae368badf3d00b7563087.gif){:width=\"350px\"}\n\n\n**示例 3**\n> 输入\b\n>`num = 3`\n>`plate = [\".....\",\"....O\",\"....O\",\".....\"]`\n> \n> 输出:`[]`\n> \n> 解释:\n> 由于弹珠被击中后只能前进 3 步,且不能在弹珠洞和弹珠盘四角打入弹珠,故不存在能让弹珠入洞的打入位置。\n\n\n**提示:**\n- `1 <= num <= 10^6`\n- `1 <= plate.length, plate[i].length <= 1000`\n- `plate[i][j]` 仅包含 `\"O\"`、`\"W\"`、`\"E\"`、`\".\"` ",
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"code": "class Solution {\npublic:\n vector<vector<int>> ballGame(int num, vector<string>& plate) {\n\n }\n};",
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