add new solutions

solutions/2/q290/solution.go

@@ -0,0 +1,30 @@
+package q290
+
+import "strings"
+
+func wordPattern(pattern string, s string) bool {
+	index := map[byte]string{}
+	invIndex := map[string]struct{}{}
+
+	fields := strings.Fields(s)
+	if len(fields) != len(pattern) {
+		return false
+	}
+
+	for i, word := range fields {
+		if w, ok := index[pattern[i]]; ok {
+			if w != word {
+				return false
+			}
+		} else {
+			if _, ok := invIndex[word]; ok {
+				return false
+			}
+			index[pattern[i]] = word
+			invIndex[word] = struct{}{}
+		}
+	}
+	return true
+}
+
+var _ = wordPattern