{ "data": { "question": { "questionId": "2226", "questionFrontendId": "2103", "boundTopicId": null, "title": "Rings and Rods", "titleSlug": "rings-and-rods", "content": "

There are n rings and each ring is either red, green, or blue. The rings are distributed across ten rods labeled from 0 to 9.

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You are given a string rings of length 2n that describes the n rings that are placed onto the rods. Every two characters in rings forms a color-position pair that is used to describe each ring where:

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For example, "R3G2B1" describes n == 3 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.

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Return the number of rods that have all three colors of rings on them.

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Example 1:

\n\"\"\n
\nInput: rings = "B0B6G0R6R0R6G9"\nOutput: 1\nExplanation: \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
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Example 2:

\n\"\"\n
\nInput: rings = "B0R0G0R9R0B0G0"\nOutput: 1\nExplanation: \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
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Example 3:

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\nInput: rings = "G4"\nOutput: 0\nExplanation: \nOnly one ring is given. Thus, no rods have all three colors.\n
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Constraints:

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