day1: add Mir based solution

day1/part1-mir/input

@@ -0,0 +1,200 @@
+1935
+1956
+1991
+1425
+1671
+1537
+1984
+1569
+1873
+1840
+1720
+1937
+1823
+1625
+1727
+1812
+1714
+1900
+1939
+1931
+1951
+1756
+1942
+1611
+1979
+1930
+1996
+2000
+1544
+1780
+1687
+1760
+1836
+1814
+1691
+1817
+1964
+1899
+1577
+1547
+866
+1560
+1988
+1601
+1970
+1738
+1507
+1667
+1851
+1933
+1515
+1856
+1969
+1860
+1801
+2007
+1866
+1800
+1749
+1843
+1711
+1495
+1905
+763
+1672
+1858
+1987
+1492
+1849
+1993
+1737
+1874
+1658
+1810
+1665
+1768
+1950
+1879
+1816
+1868
+1995
+1763
+1783
+1833
+1968
+1847
+1748
+1725
+1891
+1755
+286
+1976
+1977
+1655
+1808
+1986
+1779
+1861
+1953
+1888
+1792
+1811
+1872
+1790
+1839
+1985
+1827
+1842
+1925
+1735
+1635
+1821
+1820
+1973
+1531
+1770
+59
+1846
+1932
+1907
+1730
+933
+1395
+1753
+1751
+361
+1530
+1782
+1087
+1589
+1929
+1795
+1815
+1732
+1765
+1877
+1722
+526
+1709
+1789
+1892
+1913
+1662
+1809
+1670
+1947
+1835
+1587
+1758
+1982
+2009
+1757
+670
+1983
+1524
+1878
+1796
+1952
+566
+1922
+1882
+1870
+1799
+1731
+1724
+1805
+2003
+1596
+1566
+1853
+1911
+1857
+1739
+1744
+1627
+1729
+1745
+1845
+1582
+1884
+1883
+1941
+1764
+1685
+1791
+1837
+1697
+1742
+1781
+1948
+1876
+1989
+1643
+1871
+1906
+1726
+1958
+1502
+1927
+1946

day1/part1-mir/main.d

@@ -0,0 +1,29 @@
+#!/usr/bin/env dub
+/+ dub.sdl:
+	name "main"
+    dependency "mir-algorithm" version="~>3.10.12"
++/
+
+import std;
+import mir.combinatorics;
+
+void main()
+{
+    File("input", "r").byLine.map!(to!int).array.multiplyNEntriesThatSumTo(2, 2020).writeln;
+}
+
+alias product = partial!(reverseArgs!(fold!((a, b) => a * b)), 1);
+
+int multiplyNEntriesThatSumTo(int[] input, int n, int requiredSum)
+{
+    return input.combinations(n).filter!(combination => combination.sum == requiredSum)
+        .map!(combination => combination.product)
+        .front;
+}
+
+unittest
+{
+    auto input = [1721, 979, 366, 299, 675, 1456];
+
+    assert(input.multiplyNEntriesThatSumTo(2, 2020) == 514_579);
+}

day1/part2-mir/input

@@ -0,0 +1,200 @@
+1935
+1956
+1991
+1425
+1671
+1537
+1984
+1569
+1873
+1840
+1720
+1937
+1823
+1625
+1727
+1812
+1714
+1900
+1939
+1931
+1951
+1756
+1942
+1611
+1979
+1930
+1996
+2000
+1544
+1780
+1687
+1760
+1836
+1814
+1691
+1817
+1964
+1899
+1577
+1547
+866
+1560
+1988
+1601
+1970
+1738
+1507
+1667
+1851
+1933
+1515
+1856
+1969
+1860
+1801
+2007
+1866
+1800
+1749
+1843
+1711
+1495
+1905
+763
+1672
+1858
+1987
+1492
+1849
+1993
+1737
+1874
+1658
+1810
+1665
+1768
+1950
+1879
+1816
+1868
+1995
+1763
+1783
+1833
+1968
+1847
+1748
+1725
+1891
+1755
+286
+1976
+1977
+1655
+1808
+1986
+1779
+1861
+1953
+1888
+1792
+1811
+1872
+1790
+1839
+1985
+1827
+1842
+1925
+1735
+1635
+1821
+1820
+1973
+1531
+1770
+59
+1846
+1932
+1907
+1730
+933
+1395
+1753
+1751
+361
+1530
+1782
+1087
+1589
+1929
+1795
+1815
+1732
+1765
+1877
+1722
+526
+1709
+1789
+1892
+1913
+1662
+1809
+1670
+1947
+1835
+1587
+1758
+1982
+2009
+1757
+670
+1983
+1524
+1878
+1796
+1952
+566
+1922
+1882
+1870
+1799
+1731
+1724
+1805
+2003
+1596
+1566
+1853
+1911
+1857
+1739
+1744
+1627
+1729
+1745
+1845
+1582
+1884
+1883
+1941
+1764
+1685
+1791
+1837
+1697
+1742
+1781
+1948
+1876
+1989
+1643
+1871
+1906
+1726
+1958
+1502
+1927
+1946

day1/part2-mir/main.d

@@ -0,0 +1,29 @@
+#!/usr/bin/env dub
+/+ dub.sdl:
+	name "main"
+    dependency "mir-algorithm" version="~>3.10.12"
++/
+
+import std;
+import mir.combinatorics;
+
+void main()
+{
+    File("input", "r").byLine.map!(to!int).array.multiplyNEntriesThatSumTo(3, 2020).writeln;
+}
+
+alias product = partial!(reverseArgs!(fold!((a, b) => a * b)), 1);
+
+int multiplyNEntriesThatSumTo(int[] input, int n, int requiredSum)
+{
+    return input.combinations(n).filter!(combination => combination.sum == requiredSum)
+        .map!(combination => combination.product)
+        .front;
+}
+
+unittest
+{
+    auto input = [1721, 979, 366, 299, 675, 1456];
+
+    assert(input.multiplyNEntriesThatSumTo(3, 2020) == 241_861_950);
+}