Merge branch 'master' of github.com:baxiang/leetcode-go

Author: baxiang

367valid-perfect-square/main.go

@@ -0,0 +1,5 @@
+package main
+
+func main() {
+	
+}

647palindromic-substrings/main.go

@@ -0,0 +1,52 @@
+package main
+
+import "fmt"
+
+func countSubstrings(s string) int {
+	var res int
+	for i := 0; i < len(s); i++ {
+		for j := i + 1; j <= len(s); j++ {
+			if isPalindrome(s[i:j]) {
+				res++
+			}
+		}
+	}
+	return res
+}
+
+func countSubstrings1(s string) int {
+
+	var res int
+	flag := make([][]bool,len(s))
+	for i:=range flag{
+		flag[i]=  make([]bool,len(s))
+	}
+	for j := 0; j < len(s); j++ {
+		for i := j ; i >=0; i-- {
+			if s[i] == s[j] && (j - i < 2 || flag[i + 1][j - 1]) {
+				flag[i][j] = true
+				res++
+			}
+		}
+	}
+	return res
+}
+
+func isPalindrome(s string) bool {
+	fmt.Println(s)
+	l := 0
+	r := len(s) - 1
+	for l < r {
+		if s[l] != s[r] {
+			return false
+		}
+		l++
+		r--
+	}
+	return true
+}
+
+func main() {
+	fmt.Println(countSubstrings1("abba"))
+	//fmt.Println(countSubstrings1("aaa"))
+}

76minimum-window-substring/main.go

@@ -1,6 +1,61 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+)
+
+func minWindow1(s string, t string) string {
+	need := make(map[byte]int)
+	for i :=range t{
+		need[t[i]]++
+	}
+
+	window :=make(map[byte]int)
+	var left,right,match int
+	var minLen = 0
+	var resL int//窗口最小左边索引
+	var resR int//窗口最小右边索引
+	for right<len(s){
+		if _,ok:=need[s[right]];ok{
+			window[s[right]]++
+			if window[s[right]]==need[s[right]] {
+				match++
+			}
+		}
+		for match ==len(need){
+			l := right-left+1
+			//fmt.Println(s[left:right+1])
+			if minLen==0||l<minLen {
+				resL = left
+				resR = right
+				minLen = l
+			}
+			if v,ok:=need[s[left]];ok{
+				window[s[left]]--
+				if window[s[left]]<v{
+					match--
+				}
+			}
+			left++
+		}
+		right++
+	}
+	if minLen==0 {
+		return ""
+	}
+	return s[resL:resR+1]
+}
+
+func isContainer(strMap map[byte]int,m map[byte]int)bool{
+	for k,v:=range m{
+		if strMap[k]<v{
+			return false
+		}
+	}
+	return true
+}
+
+
 
 func minWindow(s string, t string) string {
 	need :=make(map[byte]int)
@@ -39,5 +94,6 @@ func minWindow(s string, t string) string {
    return s[resL:resR+1]
 }
 func main() {
-	fmt.Println(minWindow("ADOBECODEBANC","ABC"))
+	//fmt.Println(minWindow1("BANC","ABC"))
+	fmt.Println(minWindow1("ADOBECODEBANC","ABC"))
 }