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  1. import java.util.*;
  2. import java.util.function.*;
  3. import java.time.*;
  4. class Ideone {
  5.     private static <X, Y> Function<List<X>, List<Y>> mapi(BiFunction<Integer, X, Y> f) {
  6.         return (xs) -> {
  7.             List<Y> ys = new ArrayList<>();
  8.             for (int i = 0; i < xs.size(); i++) {
  9.                 ys.add(f.apply(Integer.valueOf(i), xs.get(i)));
  10.             }
  11.             return ys;
  12.         };
  13.     }
  14.     private static <X> Function<List<X>, List<X>> sort(Comparator<X> c) {
  15.         return (xs) -> {
  16.             List<X> ys = new ArrayList<>(xs);
  17.             ys.sort(c);
  18.             return ys;
  19.         };
  20.     }
  21.     private static <X, Y> Function<List<X>, List<Y>> map(Function<X, Y> f) {
  22.         return (xs) -> {
  23.             List<Y> ys = new ArrayList<>();
  24.             for (X x : xs) ys.add(f.apply(x));
  25.             return ys;
  26.         };
  27.     }
  28.     private static <T> Function<T, Void> function(Consumer<T> c) {
  29.         return (x) -> {c.accept(x); return null;};
  30.     }
  31.     private static <E extends Comparable<E>> List<Integer> sorti(List<E> cs) {
  32.         /*
  33.         record IndexedValue<T extends Comparable<? super T>>(Integer index, T value) implements Comparable<IndexedValue<T>> {
  34.             public int compareTo(IndexedValue<T> other) {
  35.                 return value.compareTo(other.value);
  36.             }
  37.         }
  38.         */
  39.         class IndexedValue<T extends Comparable<? super T>> implements Comparable<IndexedValue<T>> {
  40.             private Integer index;
  41.             private T value;
  42.             public Integer index() {return index;}
  43.             public IndexedValue(Integer index, T value) {this.index = index;this.value = value;}
  44.             public int compareTo(IndexedValue<T> other) {return value.compareTo(other.value);}
  45.         }
  46.         return map(IndexedValue<E>::index).compose(sort(IndexedValue<E>::compareTo)).compose(mapi(IndexedValue<E>::new)).apply(cs);
  47.     }
  48.     private static Function<List<? extends Comparable>, List<Integer>> _sorti() {
  49.         return Ideone::sorti;
  50.     }
  51.     public static void main(String[] args) {
  52.         var f = _sorti().compose(_sorti());
  53.         var g = function(System.out::println).compose(f);
  54.         g.apply(Arrays.asList(1,100,10,10000,1000));
  55.         g.apply(Arrays.asList(3,1,4,1,5,9,2));
  56.         g.apply(Arrays.asList(0,1,0,1,0,1,0,1));
  57.         g.apply(Arrays.asList("A","C","B","E","D"));
  58.         g.apply(Arrays.asList(Month.MARCH, Month.JANUARY, Month.APRIL, Month.JANUARY, Month.MAY, Month.SEPTEMBER, Month.FEBRUARY));
  59.     }
  60. }
  61.  
Success #stdin #stdout 0.11s 55836KB
comments (?)
stdin 
Standard input is empty
stdout 
[0, 2, 1, 4, 3]
[3, 0, 4, 1, 5, 6, 2]
[0, 4, 1, 5, 2, 6, 3, 7]
[0, 2, 1, 4, 3]
[3, 0, 4, 1, 5, 6, 2]
https://ideone.com/TBTZgj
language:
Java (HotSpot 12)
created:
51 days ago
visibility:
secret

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