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function checkGameIndex (checkedIndexesCache, list, index) { | |
const offset = list[index]; | |
const is0 = list[index] === 0; | |
const is0ToLeft = list[index - offset] === 0; | |
const is0ToRight = list[index + offset] === 0; | |
if (is0 || is0ToLeft || is0ToRight) { | |
return true; | |
} | |
checkedIndexesCache[index] = true; | |
const rightIndex = index + offset; | |
const canMoveToRight = rightIndex <= list.length - 1; | |
if ( | |
canMoveToRight && | |
!checkedIndexesCache[rightIndex] && | |
checkGameIndex(checkedIndexesCache, list, rightIndex) | |
) { | |
return true; | |
} | |
const leftIndex = index - offset; | |
const canMoveToLeft = leftIndex >= 0; | |
if ( | |
canMoveToLeft && | |
!checkedIndexesCache[leftIndex] && | |
checkGameIndex(checkedIndexesCache, list, leftIndex) | |
) { | |
return true; | |
} | |
return false; | |
} | |
function runGame (list, index) { | |
if (!list.length) { | |
return false; | |
} | |
// A cache to check for already reviewed indexes. | |
// This is to prevent to check on the same indexes more than once. | |
const checkedIndexesCache = {}; | |
return checkGameIndex(checkedIndexesCache, list, index); | |
} | |
console.log(0, runGame([], 2) === false); | |
console.log(1, runGame([4,9,2,100,0], 2) === true); | |
console.log(2, runGame([0,9], 1) === false); | |
console.log(3, runGame([1,1,0], 0) === true); | |
console.log(4, runGame([2,6,3,2,0,1,4], 0) === true); | |
console.log(5, runGame([2,6,3,2,0,1,4], 3) === true); | |
console.log(6, runGame([2,6,3,2,0,1,4], 1) === false); | |
console.log(7, runGame([2,6,3,2,0,2,4], 5) === false); | |
console.log(8, runGame([1, 4, 1, 1, 9, 0], 2) === true); | |
console.log(9, runGame([4,9,0,100,0], 2) === true); | |
console.log(10, runGame([1, 1, 2, 2, 1, 2, 0, 2, 1, 2, 2, 1], 5) === false); |
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