add new solutions

solutions/24/q2405/solution.go

@@ -0,0 +1,18 @@
+package q2405
+
+func partitionString(s string) int {
+	var seen int32
+
+	partitions := 1
+	for i := range len(s) {
+		offset := s[i] - 'a'
+		if seen|1<<offset == seen {
+			partitions += 1
+			seen = 0
+		}
+		seen |= 1 << offset
+	}
+	return partitions
+}
+
+var _ = partitionString