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Source file src/sort/example_search_test.go

Documentation: sort

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package sort_test
  
  import (
  	"fmt"
  	"sort"
  )
  
  // This example demonstrates searching a list sorted in ascending order.
  func ExampleSearch() {
  	a := []int{1, 3, 6, 10, 15, 21, 28, 36, 45, 55}
  	x := 6
  
  	i := sort.Search(len(a), func(i int) bool { return a[i] >= x })
  	if i < len(a) && a[i] == x {
  		fmt.Printf("found %d at index %d in %v\n", x, i, a)
  	} else {
  		fmt.Printf("%d not found in %v\n", x, a)
  	}
  	// Output:
  	// found 6 at index 2 in [1 3 6 10 15 21 28 36 45 55]
  }
  
  // This example demonstrates searching a list sorted in descending order.
  // The approach is the same as searching a list in ascending order,
  // but with the condition inverted.
  func ExampleSearch_descendingOrder() {
  	a := []int{55, 45, 36, 28, 21, 15, 10, 6, 3, 1}
  	x := 6
  
  	i := sort.Search(len(a), func(i int) bool { return a[i] <= x })
  	if i < len(a) && a[i] == x {
  		fmt.Printf("found %d at index %d in %v\n", x, i, a)
  	} else {
  		fmt.Printf("%d not found in %v\n", x, a)
  	}
  	// Output:
  	// found 6 at index 7 in [55 45 36 28 21 15 10 6 3 1]
  }
  

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