Commit b7f67a5

author

Shuo

authored

Merge pull request #603 from openset/develop

Add: 3Sum

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Lines changed: 30 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,31 @@`
`1`	`1`	`package p_3sum`
	`2`	`+`
	`3`	`+import "sort"`
	`4`	`+`
	`5`	`+func threeSum(nums []int) [][]int {`
	`6`	`+ sort.Ints(nums)`
	`7`	`+ ans, length := make([][]int, 0), len(nums)`
	`8`	`+ for i := 0; i < length-2; i++ {`
	`9`	`+ if nums[i] <= 0 && (i == 0 \|\| nums[i] != nums[i-1]) {`
	`10`	`+ l, r := i+1, length-1`
	`11`	`+ for l < r {`
	`12`	`+ sum := nums[i] + nums[l] + nums[r]`
	`13`	`+ if sum < 0 {`
	`14`	`+ l++`
	`15`	`+ } else if sum > 0 {`
	`16`	`+ r--`
	`17`	`+ } else {`
	`18`	`+ ans = append(ans, []int{nums[i], nums[l], nums[r]})`
	`19`	`+ l, r = l+1, r-1`
	`20`	`+ for l < r && nums[l] == nums[l-1] {`
	`21`	`+ l++`
	`22`	`+ }`
	`23`	`+ for l < r && nums[r] == nums[r+1] {`
	`24`	`+ r--`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+ }`
	`28`	`+ }`
	`29`	`+ }`
	`30`	`+ return ans`
	`31`	`+}`

Lines changed: 46 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -1 +1,47 @@`
`1`	`1`	`package p_3sum`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "reflect"`
	`5`	`+ "testing"`
	`6`	`+)`
	`7`	`+`
	`8`	`+type caseType struct {`
	`9`	`+ input []int`
	`10`	`+ expected [][]int`
	`11`	`+}`
	`12`	`+`
	`13`	`+func TestThreeSum(t *testing.T) {`
	`14`	`+ tests := [...]caseType{`
	`15`	`+ {`
	`16`	`+ input: []int{-1, 0, 1, 2, -1, -4},`
	`17`	`+ expected: [][]int{`
	`18`	`+ {-1, -1, 2},`
	`19`	`+ {-1, 0, 1},`
	`20`	`+ },`
	`21`	`+ },`
	`22`	`+ {`
	`23`	`+ input: []int{0, 0, 0, 0},`
	`24`	`+ expected: [][]int{`
	`25`	`+ {0, 0, 0},`
	`26`	`+ },`
	`27`	`+ },`
	`28`	`+ {`
	`29`	`+ input: []int{-2, 0, 0, 2, 2, 2},`
	`30`	`+ expected: [][]int{`
	`31`	`+ {-2, 0, 2},`
	`32`	`+ },`
	`33`	`+ },`
	`34`	`+ {`
	`35`	`+ input: []int{-2, 0, 0, 2, 2, 2, 2},`
	`36`	`+ expected: [][]int{`
	`37`	`+ {-2, 0, 2},`
	`38`	`+ },`
	`39`	`+ },`
	`40`	`+ }`
	`41`	`+ for _, tc := range tests {`
	`42`	`+ output := threeSum(tc.input)`
	`43`	`+ if !reflect.DeepEqual(output, tc.expected) {`
	`44`	`+ t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)`
	`45`	`+ }`
	`46`	`+ }`
	`47`	`+}`

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