pwc342 solution in go

2 files changed, 230 insertions, 0 deletions

diff --git a/challenge-342/pokgopun/go/ch-1.go b/challenge-342/pokgopun/go/ch-1.go
new file mode 100644
index 0000000000..6cb71202a1
--- /dev/null
+++ b/challenge-342/pokgopun/go/ch-1.go
@@ -0,0 +1,97 @@
+//# https://theweeklychallenge.org/blog/perl-weekly-challenge-342/
+/*#
+
+Task 1: Balance String
+
+Submitted by: [46]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given a string made up of lowercase English letters and digits
+   only.
+
+   Write a script to format the give string where no letter is followed by
+   another letter and no digit is followed by another digit. If there are
+   multiple valid rearrangements, always return the lexicographically
+   smallest one. Return empty string if it is impossible to format the
+   string.
+
+Example 1
+
+Input: $str = "a0b1c2"
+Output: "0a1b2c"
+
+Example 2
+
+Input: $str = "abc12"
+Output: "a1b2c"
+
+Example 3
+
+Input: $str = "0a2b1c3"
+Output: "0a1b2c3"
+
+Example 4
+
+Input: $str = "1a23"
+Output: ""
+
+Example 5
+
+Input: $str = "ab123"
+Output: "1a2b3"
+
+Task 2: Max Score
+#*/
+//# solution by pokgopun@gmail.com
+
+package main
+
+import (
+	"io"
+	"os"
+	"slices"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func bs(str string) string {
+	rs := append([]rune(str), '_')
+	slices.Sort(rs)
+	m := slices.Index(rs, '_')
+	l := len(str)
+	d := l - 2*m
+	switch d {
+	case -1, 0:
+		copy(rs[m:], rs[m+1:])
+	case 1:
+		for i := range m + 1 {
+			rs[i], rs[m+i+1] = rs[m+i+1], rs[i]
+		}
+	default:
+		return ""
+	}
+	n := max(m+d, m)
+	for i := 1; i < n; i++ {
+		for j := i; j < n; j++ {
+			rs[j], rs[n+j-i] = rs[n+j-i], rs[j]
+		}
+	}
+	return string(rs[:l])
+}
+
+func main() {
+	for _, data := range []struct {
+		input, output string
+	}{
+		{"a0b1c2", "0a1b2c"},
+		{"abc12", "a1b2c"},
+		{"0a2b1c3", "0a1b2c3"},
+		{"1a23", ""},
+		{"ab123", "1a2b3"},
+		{"abcdefg0123456", "0a1b2c3d4e5f6g"},
+		{"abcdef0123456", "0a1b2c3d4e5f6"},
+		{"abcdefg123456", "a1b2c3d4e5f6g"},
+	} {
+		io.WriteString(os.Stdout, cmp.Diff(bs(data.input), data.output)) // blank if ok, otherwise show the difference
+	}
+}
diff --git a/challenge-342/pokgopun/go/ch-2.go b/challenge-342/pokgopun/go/ch-2.go
new file mode 100644
index 0000000000..e0b69fc13c
--- /dev/null
+++ b/challenge-342/pokgopun/go/ch-2.go
@@ -0,0 +1,133 @@
+//# https://theweeklychallenge.org/blog/perl-weekly-challenge-342/
+/*#
+
+Task 2: Max Score
+
+Submitted by: [47]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given a string, $str, containing 0 and 1 only.
+
+   Write a script to return the max score after splitting the string into
+   two non-empty substrings. The score after splitting a string is the
+   number of zeros in the left substring plus the number of ones in the
+   right substring.
+
+Example 1
+
+Input: $str = "0011"
+Output: 4
+
+1: left = "0", right = "011" => 1 + 2 => 3
+2: left = "00", right = "11" => 2 + 2 => 4
+3: left = "001", right = "1" => 2 + 1 => 3
+
+Example 2
+
+Input: $str = "0000"
+Output: 3
+
+1: left = "0", right = "000" => 1 + 0 => 1
+2: left = "00", right = "00" => 2 + 0 => 2
+3: left = "000", right = "0" => 3 + 0 => 3
+
+Example 3
+
+Input: $str = "1111"
+Output: 3
+
+1: left = "1", right = "111" => 0 + 3 => 3
+2: left = "11", right = "11" => 0 + 2 => 2
+3: left = "111", right = "1" => 0 + 1 => 1
+
+Example 4
+
+Input: $str = "0101"
+Output: 3
+
+1: left = "0", right = "101" => 1 + 2 => 3
+2: left = "01", right = "01" => 1 + 1 => 2
+3: left = "010", right = "1" => 2 + 1 => 3
+
+Example 5
+
+Input: $str = "011101"
+Output: 5
+
+1: left = "0", right = "11101" => 1 + 4 => 5
+2: left = "01", right = "1101" => 1 + 3 => 4
+3: left = "011", right = "101" => 1 + 2 => 3
+4: left = "0111", right = "01" => 1 + 1 => 2
+5: left = "01110", right = "1" => 2 + 1 => 3
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 12th October
+   2025.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+#*/
+//# solution by pokgopun@gmail.com
+
+package main
+
+import (
+	"io"
+	"os"
+	"strings"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func ms(str string) int {
+	mx := 0
+	for i := range len(str) - 1 {
+		sm := strings.Count(str[:i+1], "0") + strings.Count(str[i+1:], "1")
+		if mx < sm {
+			mx = sm
+		}
+	}
+	return mx
+	/*
+		l := len(str)
+		rs := []rune(str)
+		off := make([]bool, l)
+		sm := 0
+		for i := range l {
+			if rs[i] == '0' {
+				sm++
+			} else {
+				off[i] = true
+			}
+		}
+		mx := 0
+		for l > 1 {
+			l--
+			if off[l] {
+				sm++
+			} else {
+				sm--
+			}
+			if mx < sm {
+				mx = sm
+			}
+		}
+		return mx
+	*/
+}
+
+func main() {
+	for _, data := range []struct {
+		input  string
+		output int
+	}{
+		{"0011", 4},
+		{"0000", 3},
+		{"1111", 3},
+		{"0101", 3},
+		{"011101", 5},
+		{"011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111", 86},
+	} {
+		io.WriteString(os.Stdout, cmp.Diff(ms(data.input), data.output)) // blank if ok, otherwise show the difference
+	}
+}