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Commit 8405b9a

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author
chen-shiwei
committed
feat: [贪心] 53
1 parent 001c24a commit 8405b9a

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3 files changed

+78
-23
lines changed

3 files changed

+78
-23
lines changed

‎leetcode/53.最大子序和/maxSubArray.go‎

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This file was deleted.
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package _3_最大子序和_贪心_dp
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import "math"
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func maxSubArray(nums []int) int {
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l := len(nums)
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var maxN = nums[0]
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for i := 1; i < l; i++ {
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if nums[i]+nums[i-1] > nums[i] {
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nums[i] += nums[i-1]
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}
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maxN = max(nums[i], maxN)
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}
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return maxN
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}
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func maxSubArrayWithDP(nums []int) int {
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l := len(nums)
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var dp = make([]int, l)
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dp[0] = nums[0]
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var ans int
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for i := 1; i < l; i++ {
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if nums[i]+nums[i-1] > nums[i] {
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nums[i] = nums[i] + nums[i-1]
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}
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if nums[i] > ans {
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ans = nums[i]
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}
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}
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return ans
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}
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func maxSubArrayWithGreedy(nums []int) int {
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l := len(nums)
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var ans int
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var result = math.MinInt32
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for i := 0; i < l; i++ {
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ans += nums[i]
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if ans > result {
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result = ans
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}
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if ans < 0 {
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ans = 0
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}
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}
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return result
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}
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func maxSubArrayWithFor(nums []int) int {
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l := len(nums)
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var ans = math.MinInt32
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for i := 0; i < l; i++ {
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var tmp int
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for j := i; j < l; j++ {
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tmp += nums[j]
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if tmp > ans {
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ans = tmp
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}
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}
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}
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return ans
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}
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func max(a, b int) int {
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if a >= b {
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return a
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}
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return b
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}

‎leetcode/53.最大子序和/maxSubArray_test.go‎ renamed to ‎leetcode/53.最大子序和_贪心_dp/maxSubArray_test.go‎

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Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
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package _3_最大子序和
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package _3_最大子序和_贪心_dp
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import "testing"
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@@ -17,7 +17,7 @@ func Test_maxSubArray(t *testing.T) {
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := maxSubArray(tt.args.nums); got != tt.want {
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if got := maxSubArrayWithGreedy(tt.args.nums); got != tt.want {
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t.Errorf("maxSubArray() = %v, want %v", got, tt.want)
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}
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})

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