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Commitb0c55ec

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mmapplebecktrekhleb
authored andcommitted
add recursive solution to permutations with repetitions problem (trekhleb#52)
* add recursive solution to permutations with repetitions problem* fix untested function, failing test* add comments
1 parent8d3f83c commitb0c55ec

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4 files changed

+87
-49
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4 files changed

+87
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lines changed
Lines changed: 2 additions & 49 deletions
Original file line numberDiff line numberDiff line change
@@ -1,55 +1,8 @@
11
importpermutateWithRepetitionsfrom'../permutateWithRepetitions';
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importtestPermutateWithRepetitionsFnfrom'./testPermutateWithRepetitionsFn';
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describe('permutateWithRepetitions',()=>{
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it('should permutate string with repetition',()=>{
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constpermutations0=permutateWithRepetitions([]);
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expect(permutations0).toEqual([]);
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constpermutations1=permutateWithRepetitions(['A']);
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expect(permutations1).toEqual([
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['A'],
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]);
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constpermutations2=permutateWithRepetitions(['A','B']);
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expect(permutations2).toEqual([
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['A','A'],
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['A','B'],
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['B','A'],
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['B','B'],
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]);
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constpermutations3=permutateWithRepetitions(['A','B','C']);
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expect(permutations3).toEqual([
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['A','A','A'],
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['A','A','B'],
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['A','A','C'],
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['A','B','A'],
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['A','B','B'],
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['A','B','C'],
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['A','C','A'],
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['A','C','B'],
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['A','C','C'],
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['B','A','A'],
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['B','A','B'],
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['B','A','C'],
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['B','B','A'],
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['B','B','B'],
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['B','B','C'],
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['B','C','A'],
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['B','C','B'],
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['B','C','C'],
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['C','A','A'],
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['C','A','B'],
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['C','A','C'],
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['C','B','A'],
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['C','B','B'],
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['C','B','C'],
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['C','C','A'],
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['C','C','B'],
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['C','C','C'],
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]);
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constpermutations4=permutateWithRepetitions(['A','B','C','D']);
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expect(permutations4.length).toBe(4*4*4*4);
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testPermutateWithRepetitionsFn(permutateWithRepetitions);
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});
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});
Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,8 @@
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importpermutateWithRepetitionsRecursivefrom'../permutateWithRepetitionsRecursive';
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importtestPermutateWithRepetitionsFnfrom'./testPermutateWithRepetitionsFn';
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describe('permutateWithRepetitionsRecursive',()=>{
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it('should permutate string with repetition',()=>{
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testPermutateWithRepetitionsFn(permutateWithRepetitionsRecursive);
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});
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});
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,51 @@
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exportdefaultfunctiontestPermutateWithRepetitionsFn(fn){
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constpermutations0=fn([]);
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expect(permutations0).toEqual([]);
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constpermutations1=fn(['A']);
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expect(permutations1).toEqual([
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['A'],
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]);
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constpermutations2=fn(['A','B']);
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expect(permutations2).toEqual([
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['A','A'],
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['A','B'],
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['B','A'],
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['B','B'],
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]);
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constpermutations3=fn(['A','B','C']);
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expect(permutations3).toEqual([
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['A','A','A'],
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['A','A','B'],
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['A','A','C'],
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['A','B','A'],
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['A','B','B'],
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['A','B','C'],
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['A','C','A'],
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['A','C','B'],
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['A','C','C'],
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['B','A','A'],
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['B','A','B'],
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['B','A','C'],
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['B','B','A'],
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['B','B','B'],
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['B','B','C'],
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['B','C','A'],
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['B','C','B'],
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['B','C','C'],
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['C','A','A'],
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['C','A','B'],
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['C','A','C'],
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['C','B','A'],
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['C','B','B'],
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['C','B','C'],
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['C','C','A'],
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['C','C','B'],
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['C','C','C'],
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]);
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constpermutations4=fn(['A','B','C','D']);
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expect(permutations4.length).toBe(4*4*4*4);
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}
Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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/**
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*@param {*[]} permutationOptions
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*@return {*[]}
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*/
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exportdefaultfunctionpermutateWithRepetitionsRecursive(
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options,
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n=options.length||0,
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prefix=[],
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perms=[],
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){
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// If initial options are null or empty then return empty array
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if(!options||!options.length)return[];
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// If no more iterations then add current prefix to perms array
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if(n===0){
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perms.push(prefix);
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returnperms;
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}
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// Recursively find permutations and store in perms array
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options.forEach((option)=>{
22+
permutateWithRepetitionsRecursive(options,n-1,prefix.concat([option]),perms);
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});
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returnperms;
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}

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