Javascript using Sets and Arrays - readable [Beats 93.79% of users with JavaScript]
Intuition\n Describe your first thoughts on how to solve this problem. \n\n# Approach\n Describe your approach to solving the problem. \n\n# Complexity\n- Time 
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\n\n# Complexity\n- Time complexity:\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity:\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\n/**\n * @param {number} n\n * @param {number} k\n * @return {number[]}\n */\nvar circularGameLosers = function(n, k) {\n    const setLosers = new Set();\n    const setWinners = new Set();\n    for(let indexI=1; indexI<=n; indexI++){\n        setLosers.add(indexI);\n    }\n    let indexJ=1;\n    let indexMultiply = 1;\n    while(true){\n        if(setWinners.has(indexJ)) break;\n        setWinners.add(indexJ);\n        setLosers.delete(indexJ);\n        indexJ = indexJ+((indexMultiply*k)%n);\n        indexMultiply++;\n        if(indexJ>n) indexJ=indexJ%n;\n    }\n\n    return Array.from(setLosers);\n};\n```
['JavaScript']