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Ti è piaciuto lo script? Provalo nel Terminale MetaTrader 5
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- Pubblicato:
- 2021.01.20 06:48
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//+------------------------------------------------------------------+ //| SelectionSort.mq5 | //| 2019-2021, dimitri pecheritsa | //| mql5.com/en/users/dmipec | //+------------------------------------------------------------------+ //| selection sort - array sorting algorithm | //+------------------------------------------------------------------+ //| best: n^2, average: n^2, worst: n^2 | //| memory: 1, stable: no, method: selection | //| note: stable with o(n) extra space or when using linked lists. | //+------------------------------------------------------------------+ //| in computer science, selection sort is an in-place comparison | //|sorting algorithm. it has an o(n2) time complexity, which makes | //|it inefficient on large lists, and generally performs worse than | //|the similar insertion sort. selection sort is noted for its | //|simplicity and has performance advantages over more complicated | //|algorithms in certain situations, particularly where auxiliary | //|memory is limited. | //| the time efficiency of selection sort is quadratic, so there | //|are a number of sorting techniques which have better time | //|complexity than selection sort. one thing which distinguishes | //|selection sort from other sorting algorithms is that it makes the | //|minimum possible number of swaps, n − 1 in the worst case. | //+------------------------------------------------------------------+ //+------------------------------------------------------------------+ //| script program start function | //| [use] a selection sort example. sort deals by symbol | //+------------------------------------------------------------------+ #include <Mqh\Algorithms\SelectionSort\SelectionSort.mqh> #include <Mqh\Algorithms\SelectionSort\Functions.mqh> void OnStart(void) { //--- load deals from the terminal starting from the beginning of //2021 till current day. they will be treated as the items array by //the sorter ulong deals[]; DealsLoad(deals,D'2021.01.01',0); //--- create the keys array which contains the symbols of each deal //from the deals array, which is the basis for sorting string symbols[]; DealsKeySymbol(deals,symbols); //--- sort deals by symbols in descending order with the selection //sort algorithm ArraySort(symbols,deals,new CSelectionSort<string,ulong>,false); //--- check the result of sorting by printing a table of symbols. //your table will look different DealsPrint(deals); } //-------------------------------------------------------------------- // deal | symbol //-------------------------------------------------------------------- // 170477949 | XAUUSD // 170764903 | XAUUSD // 170764902 | XAUUSD // 170252156 | XAUUSD // 170541532 | XAUUSD // 172313700 | BTCUSD // 172313699 | BTCUSD // 172313666 | BTCUSD // 172313530 | BTCUSD // 172313512 | BTCUSD // 172313511 | BTCUSD // 172313502 | BTCUSD // 172313501 | BTCUSD // 172313500 | BTCUSD // 172313493 | BTCUSD // 172313490 | BTCUSD // 172313488 | BTCUSD // 172313474 | BTCUSD // 172313453 | BTCUSD // 172313412 | BTCUSD // 171147845 | BTCUSD // 171145409 | BTCUSD // 171145256 | BTCUSD // 171145029 | BTCUSD // 171011667 | BTCUSD // 170983807 | BTCUSD // 170720576 | BTCUSD // 170429897 | BTCUSD // 169998112 | BTCUSD // 169998099 | BTCUSD // 169990154 | BTCUSD //--------------------------------------------------------------------
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