add sol

leetcode/daily/2116/sol.go

@@ -0,0 +1,46 @@
+// https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/
+
+package main
+
+import "fmt"
+
+func canBeValid(s string, locked string) bool {
+	if len(s)%2 != 0 {
+		return false
+	}
+
+	// Forward pass
+	balance := 0
+	for i := 0; i < len(s); i++ {
+		if locked[i] == '1' && s[i] == ')' {
+			balance--
+		} else {
+			balance++
+		}
+		if balance < 0 {
+			return false
+		}
+	}
+
+	// Backward pass
+	balance = 0
+	for i := len(s) - 1; i >= 0; i-- {
+		if locked[i] == '1' && s[i] == '(' {
+			balance--
+		} else {
+			balance++
+		}
+		if balance < 0 {
+			return false
+		}
+	}
+
+	return true
+}
+
+func main() {
+	s := "))()))"
+	locked := "010100"
+
+	fmt.Println(canBeValid(s, locked))
+}

leetcode/daily/916/sol.go

@@ -0,0 +1,48 @@
+// https://leetcode.com/problems/word-subsets/description/
+
+package main
+
+import "fmt"
+
+func wordSubsets(words1 []string, words2 []string) []string {
+	// count freq
+	countFrequencies := func(word string) [26]int {
+		freq := [26]int{}
+		for _, c := range word {
+			freq[c-'a']++
+		}
+		return freq
+	}
+
+	// combine max words2
+	maxFreq := [26]int{}
+	for _, word := range words2 {
+		freq := countFrequencies(word)
+		for i := 0; i < 26; i++ {
+			maxFreq[i] = max(maxFreq[i], freq[i])
+		}
+	}
+
+	result := []string{}
+	for _, word := range words1 {
+		freq := countFrequencies(word)
+		isUniversal := true
+		for i := 0; i < 26; i++ {
+			if freq[i] < maxFreq[i] {
+				isUniversal = false
+				break
+			}
+		}
+		if isUniversal {
+			result = append(result, word)
+		}
+	}
+
+	return result
+}
+
+func main() {
+	words1 := []string{"amazon", "apple", "facebook", "google", "leetcode"}
+	words2 := []string{"e", "o"}
+	fmt.Println(wordSubsets(words1, words2))
+}