add new solutions

solutions/0/q68/solution.go

@@ -0,0 +1,63 @@
+package q68
+
+var (
+	emptyLine = make([]byte, 100)
+	buf       = make([]byte, 100)
+)
+
+func init() {
+	for i := range emptyLine {
+		emptyLine[i] = ' '
+	}
+}
+
+func emitLine(line []byte, words []string, justifyLeft bool) string {
+	spaces := len(line)
+	for i := range words {
+		spaces -= len(words[i])
+	}
+	lenSep := spaces / max(len(words)-1, 1)
+	leftover := spaces % max(len(words)-1, 1)
+
+	offset := len(words[0])
+	copy(line, words[0])
+	for i := 1; i < len(words); i++ {
+		var spaces = 1
+		if !justifyLeft {
+			spaces = lenSep
+			if i <= leftover {
+				spaces++
+			}
+		}
+		offset += spaces
+		copy(line[offset:], words[i])
+		offset += len(words[i])
+	}
+	return string(line)
+}
+
+func fullJustify(words []string, maxWidth int) []string {
+	ret := []string{}
+	line := buf[:maxWidth]
+	copy(line, emptyLine)
+
+	i := 0
+	lineLen := len(words[0])
+	for j := 1; j < len(words); j++ {
+		if lineLen+1+len(words[j]) <= maxWidth {
+			lineLen += 1 + len(words[j])
+			continue
+		}
+
+		ret = append(ret, emitLine(line, words[i:j], false))
+		copy(line, emptyLine)
+
+		i = j
+		lineLen = len(words[j])
+	}
+
+	// Last line
+	return append(ret, emitLine(line, words[i:], true))
+}
+
+var _ = fullJustify