add new solutions

solutions/14/q1461/solution.go

@@ -0,0 +1,27 @@
+package q1461
+
+func hasAllCodes(s string, k int) bool {
+	if len(s) < (1<<k)+k-1 {
+		return false
+	}
+	seen := make([]bool, 1<<k)
+	nSeen := 0
+
+	c := 0
+	for i := range len(s) {
+		c = (c << 1) + int(s[i]-'0')
+		if i+1 >= k {
+			if i >= k {
+				c -= int(s[i-k]-'0') << k
+			}
+
+			if !seen[c] {
+				seen[c] = true
+				nSeen++
+			}
+		}
+	}
+	return nSeen == 1<<k
+}
+
+var _ = hasAllCodes