8 examples of 'generate permutations' in Go

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``282func (p *RangeInt) PermutationsAll() uint {283	return p.Permutations()284}``
``369func (c *CharacterClass) PermutationsAll() uint {370	return c.Permutations()371}``
``91func (p *Pointer) Permutation(i uint) error {92	permutations := p.Permutations()9394	if i &gt;= permutations {95		return &amp;token.PermutationError{96			Type: token.PermutationErrorIndexOutOfBound,97		}98	}99100	// do nothing101102	return nil103}``
``25func makePermutation(cur, n int, nums, vector []int, taken []bool, ans *[][]int) {26	if cur == n {27		tmp := make([]int, n)28		copy(tmp, vector)29		*ans = append(*ans, tmp)30		return31	}3233	used := make(map[int]bool, n-cur)3435	for i := 0; i &lt; n; i++ {3637		if !taken[i] &amp;&amp; !used[nums[i]] {38			used[nums[i]] = true3940			// 准备使用 nums[i]，所以，taken[i] == true41			taken[i] = true42			// NOTICE: 是 vector[cur]43			vector[cur] = nums[i]4445			makePermutation(cur+1, n, nums, vector, taken, ans)4647			// 下一个循环中48			// vector[cur] = nums[i+1]49			// 所以，在这个循环中，恢复 nums[i] 自由50			taken[i] = false51		}52	}53}``
``21func makePermutation(cur, n int, nums, vector []int, taken []bool, ans *[][]int) {22	if cur == n {23		tmp := make([]int, n)24		copy(tmp, vector)25		*ans = append(*ans, tmp)26		return27	}2829	for i := 0; i &lt; n; i++ {30		if !taken[i] {31			// 准备使用 nums[i]，所以，taken[i] == true32			taken[i] = true33			// NOTICE: 是 vector[cur]34			vector[cur] = nums[i]3536			makePermutation(cur+1, n, nums, vector, taken, ans)3738			// 下一个循环中39			// vector[cur] = nums[i+1]40			// 所以，在这个循环中，恢复 nums[i] 自由41			taken[i] = false42		}43	}44}``
``121func (c *Client) permutation(n int) []int {122	if c.Permutation != nil {123		return c.Permutation(n)124	}125126	var randBuf [8]byte127	if _, err := io.ReadFull(rand.Reader, randBuf[:]); err != nil {128		panic(err)129	}130131	seed := binary.LittleEndian.Uint64(randBuf[:])132	rand := mathrand.New(mathrand.NewSource(int64(seed)))133134	return rand.Perm(n)135}``
``78func nextPermutation1(nums []int) {79	// find pivot80	pivot := len(nums) - 281	for pivot &gt;= 0 &amp;&amp; nums[pivot] &gt;= nums[pivot+1] {82		pivot--83	}84	// find the furthest target in 2nd half85	if pivot &gt;= 0 {86		target := len(nums) - 187		for target &gt;= 0 &amp;&amp; nums[target] &lt;= nums[pivot] {88			target--89		}90		// swap the pivot and target91		swap(nums, pivot, target)92	}93	// reverse the 2nd half94	reverse(nums, pivot+1)95}``
``53func generateBlockerPermutations(origin Square, blockerMaskProgress uint64, currPerm uint64, rook bool) {54	if blockerMaskProgress == 0 {55		// currPerm represents one possible occupancy pattern on the blocker bitboard56		if rook {57			dbindex := (currPerm * magicNumberRook[origin]) &gt;&gt; magicRookShifts[origin]58			magicMovesRook[origin][dbindex] = rookMovesFromBlockers(origin, currPerm)59		} else {60			dbindex := (currPerm * magicNumberBishop[origin]) &gt;&gt; magicBishopShifts[origin]61			magicMovesBishop[origin][dbindex] = bishopMovesFromBlockers(origin, currPerm)62		}63		return64	}65	nextBit := bits.TrailingZeros64(blockerMaskProgress)66	blockerMaskProgress &amp;= blockerMaskProgress - 167	without := currPerm68	with := currPerm | (uint64(1) &lt;&lt; uint8(nextBit))69	generateBlockerPermutations(origin, blockerMaskProgress, without, rook)70	generateBlockerPermutations(origin, blockerMaskProgress, with, rook)71}``