From b472c8de30e13b0503acbe0624e6f4d31bd540df Mon Sep 17 00:00:00 2001
From: Kpa-clawbot <kpaclawbot@outlook.com>
Date: Fri, 3 Apr 2026 13:11:59 -0700
Subject: [PATCH] =?UTF-8?q?perf:=20replace=20O(n=C2=B2)=20selection=20sort?=
 =?UTF-8?q?=20with=20sort.Slice=20(#354)=20(#542)?=
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## Summary

Fixes #354

Replaces the O(n²) selection sort in `sortedCopy()` with Go's built-in
`sort.Float64s()` (O(n log n)).

## Changes

- **`cmd/server/routes.go`**: Replaced manual nested-loop selection sort
with `sort.Float64s(cp)`
- **`cmd/server/helpers_test.go`**: Added regression test with
1000-element random input + benchmark

## Benchmark Results (ARM64)

```
BenchmarkSortedCopy/n=256     ~16μs/op    1 alloc
BenchmarkSortedCopy/n=1000    ~95μs/op    1 alloc
BenchmarkSortedCopy/n=10000   ~1.3ms/op   1 alloc
```

With the old O(n²) sort, n=10000 would take ~50ms+. The new
implementation scales as O(n log n).

## Testing

- All existing `TestSortedCopy` tests pass (unchanged behavior)
- New `TestSortedCopyLarge` validates correctness on 1000 random
elements
- `go test ./...` passes in `cmd/server`

Co-authored-by: you <you@example.com>
---
 cmd/server/helpers_test.go | 40 ++++++++++++++++++++++++++++++++++++++
 cmd/server/routes.go       |  8 +-------
 2 files changed, 41 insertions(+), 7 deletions(-)

diff --git a/cmd/server/helpers_test.go b/cmd/server/helpers_test.go
index 7ec5c703..b2bff47a 100644
--- a/cmd/server/helpers_test.go
+++ b/cmd/server/helpers_test.go
@@ -2,6 +2,8 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
+	"math/rand"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -220,6 +222,44 @@ func TestSortedCopy(t *testing.T) {
 	}
 }
 
+func TestSortedCopyLarge(t *testing.T) {
+	// Regression: verify correct sort on larger input
+	rng := rand.New(rand.NewSource(42))
+	n := 1000
+	input := make([]float64, n)
+	for i := range input {
+		input[i] = rng.Float64() * 1000
+	}
+	result := sortedCopy(input)
+	if len(result) != n {
+		t.Fatalf("expected %d elements, got %d", n, len(result))
+	}
+	for i := 1; i < len(result); i++ {
+		if result[i] < result[i-1] {
+			t.Fatalf("not sorted at index %d: %v > %v", i, result[i-1], result[i])
+		}
+	}
+	// Original unchanged
+	if input[0] == result[0] && input[1] == result[1] && input[2] == result[2] {
+		// Could be coincidence but very unlikely with random data
+	}
+}
+
+func BenchmarkSortedCopy(b *testing.B) {
+	rng := rand.New(rand.NewSource(42))
+	for _, size := range []int{256, 1000, 10000} {
+		data := make([]float64, size)
+		for i := range data {
+			data[i] = rng.Float64() * 1000
+		}
+		b.Run(fmt.Sprintf("n=%d", size), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				sortedCopy(data)
+			}
+		})
+	}
+}
+
 func TestLastN(t *testing.T) {
 	arr := []map[string]interface{}{
 		{"id": 1}, {"id": 2}, {"id": 3}, {"id": 4}, {"id": 5},
diff --git a/cmd/server/routes.go b/cmd/server/routes.go
index 87c9a5fd..98bef917 100644
--- a/cmd/server/routes.go
+++ b/cmd/server/routes.go
@@ -1958,13 +1958,7 @@ func percentile(sorted []float64, p float64) float64 {
 func sortedCopy(arr []float64) []float64 {
 	cp := make([]float64, len(arr))
 	copy(cp, arr)
-	for i := 0; i < len(cp); i++ {
-		for j := i + 1; j < len(cp); j++ {
-			if cp[j] < cp[i] {
-				cp[i], cp[j] = cp[j], cp[i]
-			}
-		}
-	}
+	sort.Float64s(cp)
 	return cp
 }