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Commit 011dd21

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author
openset
committed
Add: 4Sum
1 parent 21b0db5 commit 011dd21

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2 files changed

+116
-0
lines changed

2 files changed

+116
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lines changed

‎problems/4sum/4sum.go

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Original file line numberDiff line numberDiff line change
@@ -1 +1,37 @@
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package p_4sum
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import "sort"
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func fourSum(nums []int, target int) [][]int {
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sort.Ints(nums)
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ans, end := make([][]int, 0), len(nums)-1
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for i := 0; i < end-2; i++ {
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if i > 0 && nums[i] == nums[i-1] {
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continue
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}
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for j := i + 1; j < end-1; j++ {
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if j > i+1 && nums[j] == nums[j-1] {
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continue
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}
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l, r := j+1, end
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for l < r {
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sum := nums[i] + nums[j] + nums[l] + nums[r]
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if sum < target {
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l++
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} else if sum > target {
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r--
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} else {
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ans = append(ans, []int{nums[i], nums[j], nums[l], nums[r]})
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l, r = l+1, r-1
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for l < r && nums[l] == nums[l-1] {
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l++
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}
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for l < r && nums[r] == nums[r+1] {
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r--
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}
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}
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}
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}
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}
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return ans
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}

‎problems/4sum/4sum_test.go

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Original file line numberDiff line numberDiff line change
@@ -1 +1,81 @@
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package p_4sum
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import (
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"reflect"
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"testing"
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)
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type caseType struct {
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input []int
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target int
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expected [][]int
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}
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func TestFourSum(t *testing.T) {
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tests := [...]caseType{
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{
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input: []int{1, 0, -1, 0, -2, 2},
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target: 0,
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expected: [][]int{
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{-2, -1, 1, 2},
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{-2, 0, 0, 2},
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{-1, 0, 0, 1},
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},
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},
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{
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input: []int{-1, 0, 1, 2, -1, -4},
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target: 0,
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expected: [][]int{
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{-1, -1, 0, 2},
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},
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},
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{
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input: []int{0, 0, 0, 0},
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target: 0,
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expected: [][]int{
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{0, 0, 0, 0},
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},
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},
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{
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input: []int{-2, 0, 0, 2, 2, 2},
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target: 0,
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expected: [][]int{
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{-2, 0, 0, 2},
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},
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},
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{
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input: []int{-2, 0, 0, 2, 2, 2, 2},
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target: 0,
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expected: [][]int{
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{-2, 0, 0, 2},
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},
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},
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{
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input: []int{-3, -2, -1, 0, 0, 1, 2, 3},
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target: 0,
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expected: [][]int{
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{-3, -2, 2, 3},
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{-3, -1, 1, 3},
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{-3, 0, 0, 3},
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{-3, 0, 1, 2},
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{-2, -1, 0, 3},
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{-2, -1, 1, 2},
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{-2, 0, 0, 2},
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{-1, 0, 0, 1},
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},
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},
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{
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input: []int{1, -2, -5, -4, -3, 3, 3, 5},
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target: -11,
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expected: [][]int{
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{-5, -4, -3, 1},
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},
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},
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}
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for _, tc := range tests {
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output := fourSum(tc.input, tc.target)
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if !reflect.DeepEqual(output, tc.expected) {
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t.Fatalf("input: %v, output: %v, expected: %v", tc.input, output, tc.expected)
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}
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}
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}

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