func Euler041() int {
//process 7 digit pandigitals
p7d := make([]int, 0, 5040) //7!
for v := range utils.Perm(utils.Numerals[1:8]) {
n, _ := strconv.Atoi(v)
p7d = append(p7d, n)
}
sort.Sort(sort.Reverse(sort.IntSlice(p7d)))
for i := 0; i < 5040; i++ {
if utils.IsPrime(p7d[i]) {
return p7d[i]
}
}
//process 4 digit pandigitals
p4d := make([]int, 0, 24) //4!
for v := range utils.Perm(utils.Numerals[1:5]) {
n, _ := strconv.Atoi(v)
p4d = append(p4d, n)
}
sort.Sort(sort.Reverse(sort.IntSlice(p4d)))
for i := 0; i < 5040; i++ {
if utils.IsPrime(p4d[i]) {
return p4d[i]
}
}
return -1
}
func main() {
studyGroup := people{"Zeno", "Ian", "John", "Al", "Jenny"}
fmt.Println("1: = sorting slice of strings of type people by name:")
fmt.Println("\to:", studyGroup)
sort.Strings(studyGroup)
fmt.Println("\t\t [Strings method]:", studyGroup)
sort.Sort(sort.StringSlice(studyGroup))
fmt.Println("\t\t [StringSlice interface conversion]", studyGroup)
sort.Sort(sort.Reverse(sort.StringSlice(studyGroup)))
fmt.Println("\t\t [Reverse]", studyGroup)
fmt.Println("2: = by literal slice of strings")
s := []string{"Zeno", "John", "Al", "Jenny", "Ben"}
fmt.Println("\to:", s)
sort.Strings(s)
fmt.Println("\t\t [Strings method]:", s)
sort.Sort(sort.StringSlice(s))
fmt.Println("\t\t [StringSlice interface conversion]", s)
sort.Sort(sort.Reverse(sort.StringSlice(s)))
fmt.Println("\t\t [Reverse]", s)
fmt.Println("3: = slice of ints")
n := []int{7, 4, 8, 2, 9, 19, 12, 32, 3}
fmt.Println("\to:", n)
sort.Ints(n)
fmt.Println("\t\t [Ints method]", n)
sort.Sort(sort.IntSlice(n))
fmt.Println("\t\t [IntSlice interface conversion]", n)
sort.Sort(sort.Reverse(sort.IntSlice(n)))
fmt.Println("\t\t [Reverse]", n)
}
func reduceSlices(numerator, denominator []int) ([]int, []int) {
sortedNum := sort.IntSlice(numerator)
sortedNum.Sort()
sortedDenom := sort.IntSlice(denominator)
sortedDenom.Sort()
j := 0
resNum := make([]int, 0)
resDenom := make([]int, 0)
for i := 0; i < len(sortedNum); {
if j > len(sortedDenom)-1 {
resNum = concatInt(resNum, sortedNum[i:])
break
}
if sortedNum[i] == sortedDenom[j] {
j++
i++
continue
}
if sortedNum[i] > sortedDenom[j] {
resDenom = append(resDenom, sortedDenom[j])
j++
continue
}
resNum = append(resNum, sortedNum[i])
i++
}
if j < len(sortedDenom) {
resDenom = concatInt(resDenom, sortedDenom[j:])
}
return resNum, resDenom
}
func TestDedup(t *testing.T) {
a := []int{}
n := Dedupe(sort.IntSlice(a))
if g, e := n, 0; g != e {
t.Fatal(g, e)
}
if g, e := len(a), 0; g != e {
t.Fatal(g, e)
}
for c := 1; c <= 7; c++ {
in := make([]int, c)
lim := int(mathutil.ModPowUint32(uint32(c), uint32(c), math.MaxUint32))
for n := 0; n < lim; n++ {
m := n
for i := range in {
in[i] = m % c
m /= c
}
in0 := append([]int(nil), in...)
out0 := dedupe(in)
n := Dedupe(sort.IntSlice(in))
if g, e := n, len(out0); g != e {
t.Fatalf("n %d, exp %d, in0 %v, in %v, out0 %v", g, e, in0, in, out0)
}
for i, v := range out0 {
if g, e := in[i], v; g != e {
t.Fatalf("n %d, in0 %v, in %v, out0 %v", n, in0, in, out0)
}
}
}
}
}
func Test_set(t *testing.T) {
a := []int{1, 2, 3, 4}
aSet := NewIntSet()
aSet.Add(a...)
cSet := aSet.Clone()
if !aSet.Equals(cSet) {
t.Error("set equality does not work properly.")
}
b := []int{3, 4, 5, 6}
bSet := NewIntSet()
bSet.Add(b...)
if !aSet.Contains(3) || aSet.Contains(10) {
t.Error("set containment does not work properly.")
}
aList := sort.IntSlice(aSet.ToList())
aList.Sort()
for i, l := range a {
if aList[i] != l {
t.Error("list representation of aSet does not match a")
}
}
bList := sort.IntSlice(bSet.ToList())
bList.Sort()
for i, l := range bList {
if b[i] != l {
t.Error("list representation of bSet does not match b")
}
}
aSet.Union(bSet)
aList = sort.IntSlice(aSet.ToList())
aList.Sort()
for i, l := range []int{1, 2, 3, 4, 5, 6} {
if aList[i] != l {
t.Error("union operation on aSet and bSet failed")
}
}
aSet.Complement(bSet)
aList = sort.IntSlice(aSet.ToList())
aList.Sort()
for i, l := range []int{1, 2} {
if aList[i] != l {
t.Error("complement operation on aSet and bSet failed")
}
}
aSet.Intersect(bSet)
aList = sort.IntSlice(aSet.ToList())
aList.Sort()
if len(aList) != 0 {
t.Error("intersect operation on aSet and bSet failed")
}
}
func main() {
// sort people as type
studyGroup := people{"Zeno", "John", "Al", "Jenny"}
fmt.Println(studyGroup)
sort.Sort(studyGroup)
fmt.Println(studyGroup)
sort.Sort(sort.Reverse(studyGroup))
fmt.Println(studyGroup)
// sort s as string slice
s := []string{"Zeno", "John", "Al", "Jenny"}
fmt.Println(s)
sort.StringSlice(s).Sort()
fmt.Println(s)
sort.Sort(sort.Reverse(sort.StringSlice(s)))
fmt.Println(s)
// sort n as int slice
n := []int{7, 4, 8, 2, 9, 19, 12, 32, 3}
fmt.Println(n)
sort.IntSlice(n).Sort()
fmt.Println(n)
sort.Sort(sort.Reverse(sort.IntSlice(n)))
fmt.Println(n)
}
func testSortFn(t *testing.T, fn sortFn, fnName string) {
for _, test := range []sort.Interface{
sort.IntSlice([]int{660, 14, 796, 336, 223, 594, 419, 574, 372, 103, 991, 718, 436, 351, 844, 277, 668, 250, 330, 86}),
sort.Float64Slice([]float64{213.237, 458.642, 978.311, 547.351, 57.8992, 245.518, 445.638, 251.79, 960.202, 100.069, 483.136, 407.858, 496.913, 562.943, 557.959, 219.648, 164.599, 843.304, 671.732, 222.676}),
sort.StringSlice([]string{"assaults", "brackish", "monarchism", "ascribe", "mechanize", "andiron", "overpricing", "jading", "hauliers", "snug", "zodiac", "credit", "tremendous", "palavered", "hibiscuses", "amplest", "interrogated", "geologic", "unorthodoxy", "propagated"}),
} {
// Make a copy to avoid modification of the original slice.
var data sort.Interface
switch v := test.(type) {
case sort.IntSlice:
data = append(sort.IntSlice(nil), v...)
case sort.Float64Slice:
data = append(sort.Float64Slice(nil), v...)
case sort.StringSlice:
data = append(sort.StringSlice(nil), v...)
default:
t.Errorf("missing case: cannot copy %T", v)
continue
}
fn(data)
if !sort.IsSorted(data) {
t.Errorf("%s(%v)", fnName, test)
t.Errorf(" got %v", data)
sort.Sort(data)
t.Errorf("want %v", data)
}
}
}
// SortMapKeysByIntValue sorts the keys of a map[string]int by its values,
// reversed if you supply true as the second arg.
func SortMapKeysByIntValue(imap map[string]int, reverse bool) (sortedKeys []string) {
// from http://stackoverflow.com/a/18695428/675083 *** should also try the
// idiomatic way to see if that's better in any way
valToKeys := map[int][]string{}
for key, val := range imap {
valToKeys[val] = append(valToKeys[val], key)
}
var vals []int
for val := range valToKeys {
vals = append(vals, val)
}
if reverse {
sort.Sort(sort.Reverse(sort.IntSlice(vals)))
} else {
sort.Sort(sort.IntSlice(vals))
}
for _, val := range vals {
for _, key := range valToKeys[val] {
sortedKeys = append(sortedKeys, key)
}
}
return
}
// SortMapKeysByMapIntValue sorts the keys of a map[string]map[string]int by
// a the values found at a given sub value, reversed if you supply true as the
// second arg.
func SortMapKeysByMapIntValue(imap map[string]map[string]int, criterion string, reverse bool) (sortedKeys []string) {
criterionValueToKeys := make(map[int][]string)
for key, submap := range imap {
val := submap[criterion]
criterionValueToKeys[val] = append(criterionValueToKeys[val], key)
}
var criterionValues []int
for val := range criterionValueToKeys {
criterionValues = append(criterionValues, val)
}
if reverse {
sort.Sort(sort.Reverse(sort.IntSlice(criterionValues)))
} else {
sort.Sort(sort.IntSlice(criterionValues))
}
for _, val := range criterionValues {
for _, key := range criterionValueToKeys[val] {
sortedKeys = append(sortedKeys, key)
}
}
return
}
func main() {
filename := "A-small-practice.in"
lines, err := readLines(filename)
if err != nil {
log.Fatalf("readLines: %s", err)
}
testCases, _ := strconv.Atoi(lines[0])
var s []string
for i := 1; i < testCases*3; i += 3 {
var v1 []string = strings.Split(lines[i+1], " ")
var v2 []string = strings.Split(lines[i+2], " ")
var v1i, v2i []int
ans := 0
tmpLen, _ := strconv.Atoi(lines[i])
for j := 0; j < tmpLen; j++ {
tmp, _ := strconv.Atoi(v1[j])
v1i = append(v1i, tmp)
tmp, _ = strconv.Atoi(v2[j])
v2i = append(v2i, tmp)
}
sort.Sort(sort.IntSlice(v1i))
sort.Sort(sort.Reverse(sort.IntSlice(v2i)))
for j := 0; j < tmpLen; j++ {
ans += v1i[j] * v2i[j]
}
s = append(s, "Case #"+strconv.Itoa((i/3)+1)+": "+strconv.Itoa(ans))
}
if err := writeLines(s, "A-small-practice.out"); err != nil {
log.Fatalf("Error!", err)
}
}
// Same determines whether the trees
// t1 and t2 contain the same values.
func Same(t1, t2 *tree.Tree) bool {
ch1, ch2, done := make(chan int), make(chan int), make(chan int)
r1, r2 := make([]int, 0), make([]int, 0)
go func() {
Walk(t1, ch1)
done <- 1
}()
go func() {
Walk(t2, ch2)
done <- 1
}()
for n := 2; n > 0; {
select {
// these two cases are almost identical, I wish I knew how to
// write a case that reads when both channels are ready
case v1 := <-ch1:
// this read could block indefinitely if t1 and t2
// have different sizes
v2 := <-ch2
if v1 != v2 {
// push these values into a slice for comparison later
r1 = append(r1, v1)
r2 = append(r2, v2)
}
case v2 := <-ch2:
// this read could block indefinitely if t1 and t2
// have different sizes
v1 := <-ch1
if v1 != v2 {
// push these values into a slice for comparison later
r1 = append(r1, v1)
r2 = append(r2, v2)
}
case <-done:
n--
}
}
// if there are any remaining values, make sure they are all the same
if len(r1) != 0 || len(r2) != 0 {
if len(r1) != len(r2) {
// this will never get hit as it would block indefinitely in the
// select above
return false
}
// sort slices to make them easy to compare
is1 := sort.IntSlice(r1)
is2 := sort.IntSlice(r2)
sort.Sort(is1)
sort.Sort(is2)
for i, x := range is1 {
if x != is2[i] {
return false
}
}
}
return true
}
func benchRandom(b *testing.B, fn sortFn, size int) {
b.StopTimer()
ints := sort.IntSlice(rand.New(rand.NewSource(int64(size))).Perm(size))
for i := 0; i < b.N; i++ {
data := append(sort.IntSlice(nil), ints...)
b.StartTimer()
fn(data)
b.StopTimer()
}
}
func main() {
{
values := []int{3, 1, 4, 1}
fmt.Println(IsPalindrome(sort.IntSlice(values))) // "false"
}
{
values := []int{3, 1, 4, 1, 3}
fmt.Println(IsPalindrome(sort.IntSlice(values))) // "true"
}
}
func products(delta int) []int {
r := []int{}
a := 999
b := 999 - delta
for a >= b {
r = append(r, a*b)
a -= 1
b += 1
}
sort.Sort(sort.Reverse(sort.IntSlice(r)))
return sort.IntSlice(r)
}
func ExampleIsUniqued() {
fmt.Println(unique.IsUniqued(sort.IntSlice([]int{1, 2, 3})))
fmt.Println(unique.IsUniqued(sort.IntSlice([]int{1, 2, 2, 3})))
// false because it isn't sorted as well.
fmt.Println(unique.IsUniqued(sort.IntSlice([]int{3, 2, 1})))
fmt.Println(unique.IsUniqued(sort.IntSlice([]int{})))
// Output:
// true
// false
// false
// true
}
// Algorithm: Multiply the largest number by the smallest number.
func (t *Solver) MinInnerProduct() int {
a1 := sort.IntSlice(t.arr1)
a1.Sort()
a2 := sort.IntSlice(t.arr2)
a2.Sort()
base.ReverseInts(a2)
out := 0
for i := 0; i < len(a1); i++ {
out += a1[i] * a2[i]
}
return out
}
func sortHand(unsorted Hand) Hand {
switch Trump {
case 'C':
return sort.IntSlice(unsorted.ClubsRank)
case 'H':
return sort.IntSlice(unsorted.HeartsRank)
case 'S':
return sort.IntSlice(unsorted.SpadesRank)
case 'D':
default:
return sort.IntSlice(unsorted.DiamondsRank)
}
}
func sameContents(a, b []int) bool {
if len(a) != len(b) {
panic("y u pass different length slices")
}
sort.IntSlice(a).Sort()
sort.IntSlice(b).Sort()
for i := range a {
if a[i] != b[i] {
return false
}
}
return true
}
func benchNearlySorted(b *testing.B, fn sortFn, size int) {
b.StopTimer()
ints := sort.IntSlice(rand.New(rand.NewSource(int64(size))).Perm(size))
sort.Sort(ints)
for i := 2; i < len(ints); i += 4 {
ints[i], ints[i-2] = ints[i-2], ints[i]
}
for i := 0; i < b.N; i++ {
data := append(sort.IntSlice(nil), ints...)
b.StartTimer()
fn(data)
b.StopTimer()
}
}
func main() {
//var n sort.IntSlice
n := []int{7, 4, 8, 2, -9, 12, -23, 32, 3}
sort.Sort(sort.Reverse(sort.IntSlice(n)))
//sort.Sort(sort.IntSlice(n))
fmt.Printf("\n %T \n", sort.Reverse(sort.IntSlice(n)))
fmt.Println(n)
//fmt.Println(n)
}
// newHand constructs a new Hand type from the given cards.
// cards is of the form e.g. [AC 8D 8H 3C 2S]
func newHand(cards []string) Hand {
trans := map[string]int{"A": 14, "K": 13, "Q": 12, "J": 11, "T": 10}
var ranks []int // The ranks field.
suits := make(map[string]bool) // The suits field.
rankToCount := make(map[int]int) // Used to create other fields.
for _, card := range cards {
s := string(card[1])
suits[s] = true
r, ok := trans[string(card[0])]
if !ok {
r, _ = strconv.Atoi(string(card[0]))
}
ranks = append(ranks, r)
rankToCount[r]++
}
sort.Sort(sort.Reverse(sort.IntSlice(ranks)))
// An ace should be played 'low' i.e. with rank 1 if it makes a straight.
if reflect.DeepEqual(ranks, []int{14, 5, 4, 3, 2}) {
ranks = []int{5, 4, 3, 2, 1}
}
var pattern []int // The pattern field.
countToRanks := make(map[int][]int) // Used to create the groups field.
for k, v := range rankToCount {
pattern = append(pattern, v)
countToRanks[v] = append(countToRanks[v], k)
}
sort.Sort(sort.Reverse(sort.IntSlice(pattern)))
var groups [][]int // The groups field.
seen := make(map[int]bool) // Used to ensure no duplicates.
for _, count := range pattern {
// For every count in the pattern append to groups a [count rank] pair.
// groups is ordered by highest count first, then highest rank first.
if !seen[count] {
rs := countToRanks[count]
sort.Sort(sort.Reverse(sort.IntSlice(rs)))
for _, r := range rs {
groups = append(groups, []int{count, r})
}
}
seen[count] = true
}
return Hand{ranks, suits, groups, pattern}
}
// Yay, sorting things is so easy in go
func keysByIntValDesc(m map[string]int) []string {
// Invert the map
inv := map[int][]string{}
for k, v := range m {
inv[v] = append(inv[v], k)
}
// List the unique vals
vals := []int{}
for k, _ := range inv {
vals = append(vals, k)
}
// Sort the vals
sort.Sort(sort.Reverse(sort.IntSlice(vals)))
// Now list the keys corresponding to each val
keys := []string{}
for _, val := range vals {
for _, key := range inv[val] {
keys = append(keys, key)
}
}
return keys
}
func Test_divide(t *testing.T) {
//Test if dividing the message works
var keys []int
for key, _ := range IPs {
keys = append(keys, key)
}
sort.Sort(sort.Reverse(sort.IntSlice(keys)))
fixtures := map[int]map[int]int{
11: map[int]int{25: 0, 10: 1, 5: 0, 1: 1},
100: map[int]int{25: 4, 10: 0, 5: 0, 1: 0},
107: map[int]int{25: 4, 10: 0, 5: 1, 1: 2},
4: map[int]int{25: 0, 10: 0, 5: 0, 1: 4},
}
for input, expected := range fixtures {
result := divide(input, keys)
failed := false
for k, v := range expected {
if result[k] != v {
failed = true
}
}
if failed {
t.Error(fmt.Sprintf("Dividing %d expected %v, got %v", input, expected, result))
}
}
}
func (s *SudokuSolver) Solve(sudoku [][]int) *Solution {
partial := s.gridToCover(sudoku)
// Iterate through the digits from biggest to smallest.
keys := make([]int, 0, len(partial))
for key, _ := range partial {
keys = append(keys, key)
}
sort.Sort(sort.Reverse(sort.IntSlice(keys)))
// log.Println("Initial config is", partial)
O := new(Solution)
k := 0
m := s.matrix
for _, digit := range keys {
for _, c := range partial[digit] {
// Find the column for existence constraint, so that all the digits are available inside.
n := m.Col(c)
n.Cover()
// Move down by <digit> nodes to find the row to include in the solution.
for j := 0; j < digit; j++ {
n = n.Down
}
O.Set(k, n)
for o := n.Right; o != n; o = o.Right {
o.Col.Cover()
}
k++
}
}
// fmt.Printf("Initial solution is\n%v", O)
s.matrix.Search(O, k, s)
return O
}
// resultsFromWinners forms results for winners of the pot
func (p *Pot) resultsFromWinners(winners hands, chips, button int, f func(n int) Share) map[int][]*Result {
results := map[int][]*Result{}
winningSeats := []int{}
for seat, hand := range winners {
winningSeats = append(winningSeats, int(seat))
results[seat] = []*Result{&Result{
Hand: hand,
Chips: chips / len(winners),
Share: f(len(winners)),
}}
}
sort.IntSlice(winningSeats).Sort()
remainder := chips % len(winners)
for i := 0; i < remainder; i++ {
seatToCheck := (button + i) % 10
for _, seat := range winningSeats {
if seat == seatToCheck {
results[seat][0].Chips++
break
}
}
}
return results
}
func encodeSettingsV3(s Settings) []byte {
if len(s) == 0 {
return []byte{}
}
ids := make([]int, 0, len(s))
for id := range s {
ids = append(ids, int(id))
}
sort.Sort(sort.IntSlice(ids))
out := make([]byte, 8*len(s))
offset := 0
for _, id := range ids {
setting := s[uint32(id)]
out[offset] = byte(setting.Flags)
out[offset+1] = byte(setting.ID >> 16)
out[offset+2] = byte(setting.ID >> 8)
out[offset+3] = byte(setting.ID)
out[offset+4] = byte(setting.Value >> 24)
out[offset+5] = byte(setting.Value >> 16)
out[offset+6] = byte(setting.Value >> 8)
out[offset+7] = byte(setting.Value)
offset += 8
}
return out
}
func (w *PkgWalker) LookupImport(pkg *types.Package, pkgInfo *types.Info, cursor *FileCursor, is *ast.ImportSpec) {
fpath, err := strconv.Unquote(is.Path.Value)
if err != nil {
return
}
fbase := fpath
pos := strings.LastIndexAny(fpath, "./-\\")
if pos != -1 {
fbase = fpath[pos+1:]
}
fid := fpath + "." + fbase
//kind := ObjPkgName
//fmt.Println(kind, true)
if typeFindDef {
fmt.Println(w.fset.Position(is.Pos()))
}
if typeFindInfo {
fmt.Println("package", fpath)
}
if !typeFindUse {
return
}
var usages []int
for id, obj := range pkgInfo.Uses {
if obj != nil && obj.Id() == fid { //!= nil && cursorObj.Pos() == obj.Pos() {
usages = append(usages, int(id.Pos()))
}
}
(sort.IntSlice(usages)).Sort()
for _, pos := range usages {
fmt.Println(w.fset.Position(token.Pos(pos)))
}
}
func main() {
f, err := os.OpenFile("input_24.txt", os.O_RDONLY, 0666)
//f, err := os.OpenFile("easy_24", os.O_RDONLY, 0666)
if err != nil {
return
}
defer f.Close()
r := bufio.NewReader(f)
for {
line, err := r.ReadString('\n')
if err != nil {
break
}
line = strings.TrimRight(line, "\n\r")
p, _ := strconv.Atoi(line)
PACKS = append(PACKS, p)
GROUP_SUM += p
}
GROUP_SUM /= GROUPS
fmt.Println("Size:", len(PACKS), "group sum:", GROUP_SUM)
sort.Sort(sort.Reverse(sort.IntSlice(PACKS)))
fmt.Println("Packs:", PACKS)
first(0, 0, 0, 1)
fmt.Println("BEST:", BEST)
}
/*rankHand scores a poker hand.
First by determining the type of hand,
Then by sorting the card ranks into their order of comparison.*/
func rankHand(ranks [5]int, suits string) [6]int {
cardGroups := groupCards(&ranks)
// Change ranks if ace is played low
if ranks == [5]int{14, 5, 4, 3, 2} {
ranks = [5]int{5, 4, 3, 2, 1}
}
isFlush, isStraight := isFlush(suits), isStraight(ranks)
var handRank [6]int
switch {
case isFlush && isStraight:
handRank[0] = straightFlush
case cardGroups == "41":
handRank[0] = fourOfAKind
case cardGroups == "32":
handRank[0] = fullHouse
case isFlush:
// Reorder so that flush can have multiple cards of the same value
sort.Sort(sort.Reverse(sort.IntSlice(ranks[:])))
handRank[0] = flush
case isStraight:
handRank[0] = straight
case cardGroups == "311":
handRank[0] = threeOfAKind
case cardGroups == "221":
handRank[0] = twoPair
case cardGroups == "2111":
handRank[0] = onePair
default:
handRank[0] = highCard
}
copy(handRank[1:6], ranks[:])
return handRank
}
func BenchmarkQuickSort(b *testing.B) {
for i := 0; i < b.N; i++ {
bigData := geneBigData()
QuickSort(sort.IntSlice(bigData), nil)
checkSortedData(bigData)
}
}