master > master: code go - ordner von internal -> pkg umgezogen

code/config.yml

@@ -85,3 +85,7 @@ parts:
     - command: 'algorithm-search-interpolation'
       description: 'Seminarblatt Woche 3, Aufgabe 1'
       inputs: *ref_inputs_sem3_1
+    - command: 'algorithm-stacks-next-greater-element'
+      description: 'Seminarblatt Woche 4, Aufgabe 1'
+      inputs:
+        L: [4, 2, 1, 100, 6, 3, 16]

code/golang/README.md

@@ -4,8 +4,8 @@
 
 Dieses Projekt ist erneut kein nötiger Bestandteil des Kurses,
 sondern nur für Wissbegierige gedacht.
-Zunächst bietet sich an, sich die Algorithmen im Unterordner [`internal/algorithms`](./internal/algorithms) anzuschauen,
-z. B. [`internal/algorithms/search/binary/binary.go`](./internal/algorithms/search/binary/binary.go) für den Binärsuchalgorithmus,
+Zunächst bietet sich an, sich die Algorithmen im Unterordner [`pkg/algorithms`](./pkg/algorithms) anzuschauen,
+z. B. [`pkg/algorithms/search/binary/binary.go`](./pkg/algorithms/search/binary/binary.go) für den Binärsuchalgorithmus,
 ohne irgendetwas installieren zu müssen.
 
 **HINWEIS 1:** _Bei meiner Implementierung kann es zu leichten Abweichungen kommen. Bitte **stets** an dem Material im VL-Skript sich orientieren. Der Hauptzweck der Code-Projekte besteht darin, dass Wissbegierige die Algorithmen konkret ausprobieren können. Alle theoretischen Aspekte werden jedoch im Skript und in den Übungen ausführlicher erklärt._

code/golang/internal/endpoints/run/run.go

@@ -11,13 +11,14 @@ import (
 	"ads/internal/setup"
 	"ads/internal/types"
 
-	algorithm_search_binary "ads/internal/algorithms/search/binary"
-	algorithm_search_interpol "ads/internal/algorithms/search/interpol"
-	algorithm_search_ith_element "ads/internal/algorithms/search/ith_element"
-	algorithm_search_jump "ads/internal/algorithms/search/jump"
-	algorithm_search_poison "ads/internal/algorithms/search/poison"
-	algorithm_search_sequential "ads/internal/algorithms/search/sequential"
-	algorithm_sum_maxsubsum "ads/internal/algorithms/sum/maxsubsum"
+	algorithm_search_binary "ads/pkg/algorithms/search/binary"
+	algorithm_search_interpol "ads/pkg/algorithms/search/interpol"
+	algorithm_search_ith_element "ads/pkg/algorithms/search/ith_element"
+	algorithm_search_jump "ads/pkg/algorithms/search/jump"
+	algorithm_search_poison "ads/pkg/algorithms/search/poison"
+	algorithm_search_sequential "ads/pkg/algorithms/search/sequential"
+	algorithm_stacks_next_greater_element "ads/pkg/algorithms/stacks/next_greater_element"
+	algorithm_sum_maxsubsum "ads/pkg/algorithms/sum/maxsubsum"
 )
 
 /* ---------------------------------------------------------------- *
@@ -138,6 +139,13 @@ func RunNonInteractive(path string) error {
 				} else {
 					err_case = fmt.Errorf("Fehlende Inputs für Befehl '%[1]s'.", *problem.Command)
 				}
+			case "algorithm-stacks-next-greater-element":
+				L := inputs.List
+				if L != nil {
+					_, err_case = algorithm_stacks_next_greater_element.FancyNextGreaterElement(*L)
+				} else {
+					err_case = fmt.Errorf("Fehlende Inputs für Befehl '%[1]s'.", *problem.Command)
+				}
 			case "algorithm-sum-maxsub":
 				L := inputs.List
 				if L != nil {

code/golang/internal/endpoints/run/run_actions_algorithms.go

@@ -8,17 +8,18 @@ import (
 	"ads/internal/core/logging"
 	"ads/internal/setup"
 
-	algorithm_search_binary "ads/internal/algorithms/search/binary"
-	algorithm_search_interpol "ads/internal/algorithms/search/interpol"
-	algorithm_search_ith_element "ads/internal/algorithms/search/ith_element"
-	algorithm_search_jump "ads/internal/algorithms/search/jump"
-	algorithm_search_poison "ads/internal/algorithms/search/poison"
-	algorithm_search_sequential "ads/internal/algorithms/search/sequential"
-	algorithm_sum_maxsubsum "ads/internal/algorithms/sum/maxsubsum"
+	algorithm_search_binary "ads/pkg/algorithms/search/binary"
+	algorithm_search_interpol "ads/pkg/algorithms/search/interpol"
+	algorithm_search_ith_element "ads/pkg/algorithms/search/ith_element"
+	algorithm_search_jump "ads/pkg/algorithms/search/jump"
+	algorithm_search_poison "ads/pkg/algorithms/search/poison"
+	algorithm_search_sequential "ads/pkg/algorithms/search/sequential"
+	algorithm_stacks_next_greater_element "ads/pkg/algorithms/stacks/next_greater_element"
+	algorithm_sum_maxsubsum "ads/pkg/algorithms/sum/maxsubsum"
 )
 
 /* ---------------------------------------------------------------- *
- * ACTIONS - Algorithmen
+ * ACTIONS algorithmen - search
  * ---------------------------------------------------------------- */
 
 func actionAlgorithmSearchBinary() (bool, error) {
@@ -202,6 +203,28 @@ func actionAlgorithmSearchSequential() (bool, error) {
 	return cancel, nil
 }
 
+/* ---------------------------------------------------------------- *
+ * ACTIONS algorithmen - stacks
+ * ---------------------------------------------------------------- */
+
+func actionAlgorithmStacksNextGreaterElement() (bool, error) {
+	input_L, cancel, err := promptInputListOfInt("L", "Liste von Werten", []string{})
+	if cancel || err != nil {
+		return cancel, err
+	}
+	setup.DisplayStartOfCaseBlank()
+	_, err = algorithm_stacks_next_greater_element.FancyNextGreaterElement(input_L)
+	if err != nil {
+		logging.Error(err)
+	}
+	setup.DisplayEndOfCase()
+	return cancel, nil
+}
+
+/* ---------------------------------------------------------------- *
+ * ACTIONS algorithmen - sum
+ * ---------------------------------------------------------------- */
+
 func actionAlgorithmSumMaxsub() (bool, error) {
 	input_L, cancel, err := promptInputListOfInt("L", "Liste von Werten", []string{})
 	if cancel || err != nil {

code/golang/internal/endpoints/run/run_menus.go

@@ -27,6 +27,7 @@ var menuMain = menus.Menu{
 		}, {
 			{Label: "Suchalgorithmen", Submenu: &menuSearchAlgorithms},
 			{Label: "Summenalgorithmen", Submenu: &menuSumAlgorithms},
+			{Label: "Algorithmen mit Stacks und Queues", Submenu: &menuStacksQueuesAlgorithms},
 		},
 	},
 	Default: -1,
@@ -117,6 +118,19 @@ var menuSearchAlgorithms = menus.Menu{
 	Default: -1,
 }
 
+var menuStacksQueuesAlgorithms = menus.Menu{
+	Path: []string{"Hauptmenü", "Algorithmen mit Stacks und Queues"},
+	PromptMessages: []string{
+		"Algorithmus wählen",
+	},
+	Options: [][]menus.MenuOption{
+		{
+			{Label: "'Next Greater Element' mit Stacks", Action: actionAlgorithmStacksNextGreaterElement},
+		},
+	},
+	Default: -1,
+}
+
 var menuSumAlgorithms = menus.Menu{
 	Path: []string{"Hauptmenü", "Summenalgorithmen"},
 	PromptMessages: []string{

code/golang/internal/setup/setup_display.go

@@ -103,8 +103,8 @@ func DisplayEndOfAlgorithm(outputs map[string]interface{}) {
 func DisplayMetrics() {
 	// logging.Plain("Dauer der Ausführung:   t  = \033[1m%[1]v\033[0m", metrics.GetTimeElapsed())
 	logging.Plain("Dauer der Ausführung:   t  = \033[1m%[1]v\033[0m", metrics.GetTimeElapsedLongFormat())
-	logging.Plain("Kosten (Zeit):        T(n) = \033[1m%[1]v\033[0m", metrics.GetTimeCost())
-	logging.Plain("Kosten (Platz):       S(n) = \033[1m%[1]v\033[0m", metrics.GetSpaceCost())
+	logging.Plain("Kosten (Zeit):        T(n) = \033[1m%[1]v\033[0m", displayCost(metrics.GetTimeCost()))
+	logging.Plain("Kosten (Platz):       S(n) = \033[1m%[1]v\033[0m", displayCost(metrics.GetSpaceCost()))
 	return
 }
 
@@ -120,3 +120,10 @@ func DisplayBar(options ...int) {
 	logging.Plain("+%[1]s+", strings.Repeat("-", n))
 	return
 }
+
+func displayCost(cost int) string {
+	if cost > 0 {
+		return fmt.Sprintf("%v", cost)
+	}
+	return "-"
+}

code/golang/pkg/algorithms/search/interpol/interpol.go

@@ -38,15 +38,14 @@ func InterpolationSearch(L []int, x int, u int, v int) int {
 	}
 	metrics.AddTimeCost()
 	p := getSuchposition(L, x, u, v)
-	logging.Debug("Interpolante von x in (u, v)=(%[1]v, %[2]v) ist p = %[3]v.", u, v, p)
 	if L[p] == x {
-		logging.Debug("x in Position p gefunden")
+		logging.Debug("Interpolante in (%[1]v, %[2]v) ist p = %[3]v; L[p] == x; ===> Element gefunden", u, v, p)
 		return p
 	} else if x < L[p] {
-		logging.Debug("Suche in linker Hälfte fortsetzen.")
+		logging.Debug("Interpolante in (%[1]v, %[2]v) ist p = %[3]v; L[p] > x; ===> suche in linker Hälfte", u, v, p)
 		return InterpolationSearch(L, x, u, p-1)
 	} else { // } else if x > L[p] {
-		logging.Debug("Suche in rechter Hälfte fortsetzen.")
+		logging.Debug("Interpolante in (%[1]v, %[2]v) ist p = %[3]v; L[p] < x; ===> suche in rechter Hälfte", u, v, p)
 		return InterpolationSearch(L, x, p+1, v)
 	}
 }

code/golang/pkg/algorithms/search/jump/jump.go

@@ -5,9 +5,9 @@ package jump
  * ---------------------------------------------------------------- */
 
 import (
-	"ads/internal/algorithms/search/sequential"
 	"ads/internal/core/logging"
 	"ads/internal/core/metrics"
+	"ads/pkg/algorithms/search/sequential"
 )
 
 /* ---------------------------------------------------------------- *

code/golang/pkg/algorithms/stacks/next_greater_element/next_greater_element.go

@@ -0,0 +1,107 @@
+package next_greater_element
+
+/* ---------------------------------------------------------------- *
+ * IMPORTS
+ * ---------------------------------------------------------------- */
+
+import (
+	"ads/internal/core/logging"
+	"ads/internal/core/metrics"
+	"ads/pkg/data_structures/stacks"
+)
+
+/* ---------------------------------------------------------------- *
+ * GLOBAL VARIABLES/CONSTANTS
+ * ---------------------------------------------------------------- */
+
+var _output_list [][2]int
+
+/* ---------------------------------------------------------------- *
+ * ALGORITHM next greater element
+ * ---------------------------------------------------------------- */
+
+/*
+Inputs: L = Liste von Zahlen, x = Zahl.
+
+Outputs: Liste von Paaren von Elementen und ihrem nächsten größeren Element
+*/
+func NextGreaterElement(L []int) [][2]int {
+	clearOutput()
+	if len(L) == 0 {
+		return output()
+	}
+
+	S := stacks.CREATE()
+
+	for i := 0; i < len(L); i++ {
+		logging.Debug("Lies Element L[%v] ein", i)
+		nextElement := L[i]
+
+		logging.Debug("Stack S | %v", S)
+		if !S.EMPTY() {
+			logging.Debug("Entferne alle top Elemente vom Stack bis >= nextElement")
+			element := S.TOP()
+			S.POP()
+			metrics.AddTimeCost()
+			/*
+				Entferne kleinere Elemente vom Stack
+				Aktuelles Element ist jeweils größerer rechter Partner
+			*/
+			for element < nextElement {
+				logging.Debug("Stack S | %v", S)
+				addToOutput(element, nextElement)
+				if S.EMPTY() {
+					break
+				}
+				element = S.TOP()
+				S.POP()
+				metrics.AddTimeCost()
+			}
+
+			// lege letztes Element zurück
+			if element > nextElement {
+				logging.Debug("Element >= nextElement zurücklegen")
+				S.PUSH(element)
+				metrics.AddTimeCost()
+			}
+			logging.Debug("Stack S | %v", S)
+		}
+
+		S.PUSH(nextElement)
+		metrics.AddTimeCost()
+		logging.Debug("L[%v] auf Stack legen", i)
+		logging.Debug("Stack S | %v", S)
+	}
+
+	// was übrig bleibt hat kein größeres Element
+	logging.Debug("Alles übrige auf Stack hat kein nächstes größeres Element")
+	for !S.EMPTY() {
+		metrics.AddTimeCost()
+		logging.Debug("Stack S | %v", S)
+		element := S.TOP()
+		S.POP()
+		addToOutput(element, -1)
+	}
+	logging.Debug("Stack S | %v", S)
+
+	return output()
+}
+
+/* ---------------------------------------------------------------- *
+ * AUXILIARY METHODS
+ * ---------------------------------------------------------------- */
+
+func clearOutput() {
+	_output_list = [][2]int{}
+}
+
+func addToOutput(m int, n int) {
+	_output_list = append(_output_list, [2]int{m, n})
+}
+
+func output() [][2]int {
+	var output = make([][2]int, len(_output_list))
+	copy(output, _output_list)
+	clearOutput()
+	return output
+}

code/golang/pkg/algorithms/stacks/next_greater_element/next_greater_element_fancy.go

@@ -0,0 +1,89 @@
+package next_greater_element
+
+/* ---------------------------------------------------------------- *
+ * IMPORTS
+ * ---------------------------------------------------------------- */
+
+import (
+	"ads/internal/core/metrics"
+	"ads/internal/setup"
+)
+
+/* ---------------------------------------------------------------- *
+ * GLOBAL VARIABLES/CONSTANTS
+ * ---------------------------------------------------------------- */
+
+//
+
+/* ---------------------------------------------------------------- *
+ * CHECKS
+ * ---------------------------------------------------------------- */
+
+func preChecks(L []int, _ ...interface{}) error {
+	// TODO
+	return nil
+}
+
+func postChecks(L []int, pairs [][2]int, _ ...interface{}) error {
+	// TODO
+	return nil
+}
+
+/* ---------------------------------------------------------------- *
+ * ALGORITHM binary search + Display
+ * ---------------------------------------------------------------- */
+
+func FancyNextGreaterElement(input_L []int) ([][2]int, error) {
+	var name = "Binärsuchalgorithmus"
+	var inputs = map[string]interface{}{
+		"L": input_L,
+	}
+	var outputs map[string]interface{}
+	var (
+		pairs [][2]int
+	)
+	var err error
+
+	do_once := true
+	for do_once {
+		do_once = false
+
+		// Start Message
+		setup.DisplayStartOfAlgorithm(name, inputs)
+
+		// Prechecks:
+		if setup.AppConfigPerformChecks() {
+			err = preChecks(input_L)
+			if err != nil {
+				break
+			}
+		}
+
+		// Ausführung des Algorithmus:
+		metrics.ResetMetrics()
+		metrics.StartMetrics()
+		pairs = NextGreaterElement(input_L)
+		metrics.StopMetrics()
+		outputs = map[string]interface{}{
+			"pairs": pairs,
+		}
+
+		// Metriken anzeigen
+		if setup.AppConfigShowMetrics() {
+			setup.DisplayMetrics()
+		}
+
+		// End Message
+		setup.DisplayEndOfAlgorithm(outputs)
+
+		// Postchecks:
+		if setup.AppConfigPerformChecks() {
+			err = postChecks(input_L, pairs)
+			if err != nil {
+				break
+			}
+		}
+	}
+
+	return pairs, err
+}

code/golang/pkg/data_structures/stacks/stacks.go

@@ -0,0 +1,72 @@
+package stacks
+
+/* ---------------------------------------------------------------- *
+ * IMPORTS
+ * ---------------------------------------------------------------- */
+
+import (
+	"fmt"
+	"strings"
+)
+
+/* ---------------------------------------------------------------- *
+ * GLOBAL VARIABLES/CONSTANTS
+ * ---------------------------------------------------------------- */
+
+//
+
+/* ---------------------------------------------------------------- *
+ * TYPE
+ * ---------------------------------------------------------------- */
+
+type StackInt struct {
+	values []int
+}
+
+/* ---------------------------------------------------------------- *
+ * METHODS stacks
+ * ---------------------------------------------------------------- */
+
+func CREATE() StackInt {
+	return StackInt{
+		values: []int{},
+	}
+}
+
+func (S *StackInt) INIT() StackInt {
+	return StackInt{
+		values: []int{},
+	}
+}
+
+func (S StackInt) EMPTY() bool {
+	return len(S.values) == 0
+}
+
+func (S *StackInt) PUSH(x int) {
+	S.values = append(S.values, x)
+}
+
+func (S *StackInt) TOP() int {
+	if S.EMPTY() {
+		panic("Cannot pop from empty stack!")
+	}
+	return S.values[len(S.values)-1]
+}
+
+func (S *StackInt) POP() int {
+	x := S.TOP()
+	S.values = S.values[:(len(S.values) - 1)]
+	return x
+}
+
+func (S StackInt) String() string {
+	if len(S.values) == 0 {
+		return "-"
+	}
+	values := []string{}
+	for _, value := range S.values {
+		values = append(values, fmt.Sprintf("%v", value))
+	}
+	return fmt.Sprintf(strings.Join(values, ", "))
+}