mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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168 lines
17 KiB
JSON
168 lines
17 KiB
JSON
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"title": "Rings and Rods",
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"titleSlug": "rings-and-rods",
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"content": "<p>There are <code>n</code> rings and each ring is either red, green, or blue. The rings are distributed <strong>across ten rods</strong> labeled from <code>0</code> to <code>9</code>.</p>\n\n<p>You are given a string <code>rings</code> of length <code>2n</code> that describes the <code>n</code> rings that are placed onto the rods. Every two characters in <code>rings</code> forms a <strong>color-position pair</strong> that is used to describe each ring where:</p>\n\n<ul>\n\t<li>The <strong>first</strong> character of the <code>i<sup>th</sup></code> pair denotes the <code>i<sup>th</sup></code> ring's <strong>color</strong> (<code>'R'</code>, <code>'G'</code>, <code>'B'</code>).</li>\n\t<li>The <strong>second</strong> character of the <code>i<sup>th</sup></code> pair denotes the <strong>rod</strong> that the <code>i<sup>th</sup></code> ring is placed on (<code>'0'</code> to <code>'9'</code>).</li>\n</ul>\n\n<p>For example, <code>"R3G2B1"</code> describes <code>n == 3</code> rings: a red ring placed onto the rod labeled 3, a green ring placed onto the rod labeled 2, and a blue ring placed onto the rod labeled 1.</p>\n\n<p>Return <em>the number of rods that have <strong>all three colors</strong> of rings on them.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/23/ex1final.png\" style=\"width: 258px; height: 130px;\" />\n<pre>\n<strong>Input:</strong> rings = "B0B6G0R6R0R6G9"\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> \n- The rod labeled 0 holds 3 rings with all colors: red, green, and blue.\n- The rod labeled 6 holds 3 rings, but it only has red and blue.\n- The rod labeled 9 holds only a green ring.\nThus, the number of rods with all three colors is 1.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/11/23/ex2final.png\" style=\"width: 266px; height: 130px;\" />\n<pre>\n<strong>Input:</strong> rings = "B0R0G0R9R0B0G0"\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> \n- The rod labeled 0 holds 6 rings with all colors: red, green, and blue.\n- The rod labeled 9 holds only a red ring.\nThus, the number of rods with all three colors is 1.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> rings = "G4"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> \nOnly one ring is given. Thus, no rods have all three colors.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>rings.length == 2 * n</code></li>\n\t<li><code>1 <= n <= 100</code></li>\n\t<li><code>rings[i]</code> where <code>i</code> is <strong>even</strong> is either <code>'R'</code>, <code>'G'</code>, or <code>'B'</code> (<strong>0-indexed</strong>).</li>\n\t<li><code>rings[i]</code> where <code>i</code> is <strong>odd</strong> is a digit from <code>'0'</code> to <code>'9'</code> (<strong>0-indexed</strong>).</li>\n</ul>\n",
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"code": "/**\n * @param {string} rings\n * @return {number}\n */\nvar countPoints = function(rings) {\n \n};",
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"code": "# @param {String} rings\n# @return {Integer}\ndef count_points(rings)\n \nend",
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"code": "impl Solution {\n pub fn count_points(rings: String) -> i32 {\n \n }\n}",
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"For every rod, look through ‘rings’ to see if the rod contains all colors.",
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"Create 3 booleans, 1 for each color, to store if that color is present for the current rod. If all 3 are true after looking through the string, then the rod contains all the colors."
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