add new solutions

solutions/9/q901/solution.go

@@ -0,0 +1,39 @@
+package q901
+
+type Price struct {
+	day   int
+	price int
+}
+
+type StockSpanner struct {
+	days       []Price
+	currentDay int
+}
+
+func Constructor() StockSpanner { return StockSpanner{} }
+
+func (s *StockSpanner) Next(price int) int {
+	s.currentDay++
+
+	curr := Price{day: s.currentDay, price: price}
+	i := len(s.days) - 1
+	for ; i >= 0; i-- {
+		if s.days[i].price > curr.price {
+			break
+		}
+	}
+	s.days = s.days[:i+1]
+
+	ret := s.currentDay
+	if len(s.days) > 0 {
+		ret = s.currentDay - s.days[len(s.days)-1].day
+	}
+	s.days = append(s.days, curr)
+	return ret
+}
+
+/**
+ * Your StockSpanner object will be instantiated and called as such:
+ * obj := Constructor();
+ * param_1 := obj.Next(price);
+ */