Open erbing opened 5 years ago
/** [1, 2] [3, 4, 5] [6, 7, 8] */
function gen (...xss) {
const len = xss.length
const ret = []
if (len === 0) {
return ret
}
function genCore (acc, xssIndex) {
const xs = xss[xssIndex]
if (xs.length !== 0) {
xs.forEach((x, i) => {
const newAcc = [...acc, x]
if (xssIndex + 1 === len) {
ret.push(newAcc)
return
}
genCore(newAcc, xssIndex + 1)
})
return
}
genCore(acc, xssIndex + 1)
}
genCore([], 0)
return ret
}
function test (...xs) {
console.time('gen')
const ret = gen(...xs)
console.timeEnd('gen')
return ret
}
test([1, 2, 3, 4, 5], [1, 2, 3, 4, 5], [6, 7, 8, 9, 10])
爽不爽
function cartesian (...lists) {
return lists
.map(list => list.map(item => [item]))
.reduce((listsA, listsB) =>
listsA.reduce((list, listA) =>
list.concat(
listsB.map(listB => listA.concat(listB))
), []
)
)
}
有这么几个变量:
实现一个函数 getArranging 可以返回它们的可能值的排列组合二维数组: