master > master: code - nextGreaterEl alg für python, vereinfachte Algorithmus für py + go
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@ -34,52 +34,45 @@ func NextGreaterElement(L []int) [][2]int {
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S := stacks.CREATE()
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for i := 0; i < len(L); i++ {
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logging.Debug("Lies Element L[%v] ein", i)
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logging.Debug("Nächstes List-Element L[%v] = %v betrachten", i, L[i])
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nextElement := L[i]
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logging.Debug("Entferne alle top Elemente vom Stack bis >= nextElement")
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/*
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Entferne alle top Elemente vom Stack < nextElement
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bis oben ein Elment >= nextElement ist, oder Stack leer ist.
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*/
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logging.Debug("Stack S | %v", S)
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if !S.EMPTY() {
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logging.Debug("Entferne alle top Elemente vom Stack bis >= nextElement")
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for !S.EMPTY() {
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element := S.TOP()
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S.POP()
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metrics.AddTimeCost()
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/*
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Entferne kleinere Elemente vom Stack
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Aktuelles Element ist jeweils größerer rechter Partner
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*/
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for element < nextElement {
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logging.Debug("Stack S | %v", S)
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metrics.AddMovesCost()
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logging.Debug("Stack S | %v; (popped) Top-Element = %v", S, element)
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// falls element < next Element, zum Output hinzufügen
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if element < nextElement {
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addToOutput(element, nextElement)
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if S.EMPTY() {
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break
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}
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element = S.TOP()
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S.POP()
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metrics.AddTimeCost()
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}
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// lege letztes Element zurück
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if element > nextElement {
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logging.Debug("Element >= nextElement zurücklegen")
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// sonst Element auf Stack zurücklegen und Schleife abbrechen.
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} else {
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logging.Debug("Stack-Element >= nextElement ==> zurücklegen")
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S.PUSH(element)
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metrics.AddTimeCost()
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metrics.AddMovesCost()
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break
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}
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logging.Debug("Stack S | %v", S)
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}
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S.PUSH(nextElement)
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metrics.AddTimeCost()
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logging.Debug("L[%v] auf Stack legen", i)
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S.PUSH(nextElement)
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logging.Debug("Stack S | %v", S)
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metrics.AddMovesCost()
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}
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// was übrig bleibt hat kein größeres Element
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logging.Debug("Alles übrige auf Stack hat kein nächstes größeres Element")
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for !S.EMPTY() {
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metrics.AddTimeCost()
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logging.Debug("Stack S | %v", S)
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element := S.TOP()
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S.POP()
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metrics.AddMovesCost()
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addToOutput(element, -1)
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}
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logging.Debug("Stack S | %v", S)
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@ -6,4 +6,5 @@
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from src.algorithms.search.exports import *;
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from src.algorithms.stacks.exports import *;
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from src.algorithms.sum.exports import *;
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code/python/src/algorithms/stacks/__init__.py
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code/python/src/algorithms/stacks/__init__.py
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8
code/python/src/algorithms/stacks/exports.py
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code/python/src/algorithms/stacks/exports.py
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@ -0,0 +1,8 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# EXPORTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from src.algorithms.stacks.next_greater_element import NextGreaterElement;
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code/python/src/algorithms/stacks/next_greater_element.py
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107
code/python/src/algorithms/stacks/next_greater_element.py
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@ -0,0 +1,107 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# IMPORTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from src.local.typing import *;
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from src.core.log import *;
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from src.core.metrics import *;
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from src.data_structures.stacks import Stack;
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from src.algorithms.methods import *;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# GLOBAL VARIABLES/CONSTANTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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_output_list: List[Tuple[int,int]]
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# CHECKS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def preChecks(L: List[int], **_):
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# TODO
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return;
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def postChecks(L: List[int], **_):
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# TODO
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return;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# ALGORITHM next greater element
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@algorithmInfos(name='NextGreaterElement (with stacks)', outputnames=['pairs'], preChecks=preChecks, postChecks=postChecks)
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def NextGreaterElement(L: List[int]) -> List[Tuple[int,int]]:
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'''
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Inputs: L = Liste von Zahlen, x = Zahl.
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Outputs: Liste von Paaren von Elementen und ihrem nächsten größeren Element
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'''
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clearOutput();
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S = Stack();
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S.INIT();
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for i in range(len(L)):
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logDebug('Nächstes List-Element L[{i}] = {el} betrachten'.format(i=i, el=L[i]));
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nextElement = L[i];
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logDebug('Entferne alle top Elemente vom Stack bis >= nextElement');
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# Entferne alle top Elemente vom Stack < nextElement
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# bis oben ein Elment >= nextElement ist, oder Stack leer ist.
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logDebug('Stack S | {S}'.format(S=S));
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while not S.EMPTY():
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element = S.TOP();
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S.POP();
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AddMovesCost();
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logDebug('Stack S | {S}; (popped) Top-Element = {el}'.format(S=S, el=element))
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# falls element < next Element, zum Output hinzufügen
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if element < nextElement:
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addToOutput(element, nextElement);
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# sonst Element auf Stack zurücklegen und Schleife abbrechen.
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else:
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logDebug('Stack element >= nextElement ==> zurücklegen')
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S.PUSH(element);
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AddMovesCost();
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break;
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logDebug('Stack S | {S}'.format(S=S));
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logDebug('L[{i}] auf Stack legen'.format(i=i));
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S.PUSH(nextElement);
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logDebug('Stack S | {S}'.format(S=S));
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AddMovesCost();
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# was übrig bleibt hat kein größeres Element
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logDebug('Alles übrige auf Stack hat kein nächstes größeres Element')
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while not S.EMPTY():
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logDebug('Stack S | {S}'.format(S=S));
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element = S.TOP();
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S.POP();
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AddMovesCost();
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addToOutput(element, -1);
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logDebug('Stack S | {S}'.format(S=S))
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return output();
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# AUXILIARY METHODS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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def clearOutput():
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global _output_list;
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_output_list = [];
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return;
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def addToOutput(m: int, n: int):
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global _output_list;
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_output_list.append((m, n))
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return;
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def output() -> List[Tuple[int, int]]:
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global _output_list;
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output = _output_list[:] # erstelle Kopie
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clearOutput()
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return output
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code/python/src/data_structures/__init__.py
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0
code/python/src/data_structures/__init__.py
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45
code/python/src/data_structures/stacks.py
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45
code/python/src/data_structures/stacks.py
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@ -0,0 +1,45 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# IMPORTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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from local.typing import *;
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# GLOBAL VARIABLES/CONSTANTS
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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#
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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# CLASS Stack
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# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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class Stack(object):
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values: List[int];
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def INIT(self):
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self.values = [];
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def EMPTY(self) -> bool:
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return len(self.values) == 0;
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def PUSH(self, x: int):
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self.values.append(x);
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def TOP(self) -> int:
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if self.EMPTY():
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raise Exception('Cannot pop from empty stack!')
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return self.values[-1];
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def POP(self) -> int:
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x = self.TOP()
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self.values = self.values[:-1]
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return x
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def __str__(self) -> str:
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if len(self.values) == 0:
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return '-';
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return ', '.join([str(x) for x in self.values]);
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@ -39,11 +39,7 @@ def runNonInteractive(path: str):
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DisplayStartOfCase(caseindex, descr);
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try:
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if command == 'algorithm-sum-maxsub':
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MaxSubSum(L=inputs['L']);
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elif command == 'algorithm-sum-maxsub-dc':
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MaxSubSumDC(L=inputs['L']);
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elif command == 'algorithm-search-sequential':
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if command == 'algorithm-search-sequential':
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SequentialSearch(L=inputs['L'], x=inputs['x']);
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elif command == 'algorithm-search-binary':
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BinarySearch(L=inputs['L'], x=inputs['x']);
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@ -61,6 +57,12 @@ def runNonInteractive(path: str):
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FindPoison(L=inputs['L']);
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elif command == 'algorithm-search-poison-fast':
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FindPoisonFast(L=inputs['L']);
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elif command == 'algorithm-stacks-next-greater-element':
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NextGreaterElement(L=inputs['L']);
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elif command == 'algorithm-sum-maxsub':
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MaxSubSum(L=inputs['L']);
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elif command == 'algorithm-sum-maxsub-dc':
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MaxSubSumDC(L=inputs['L']);
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else:
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raise ValueError('Command \033[1m{}\033[0m nicht erkannt'.format(command));
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except Exception as e:
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