feat: add solutions to lc problem: No.0567 (#3949)

No.0567.Permutation in String

Author: yanglbme

solution/0500-0599/0567.Permutation in String/README.md

@@ -1,25 +1,29 @@
 class Solution {
 public:
     bool checkInclusion(string s1, string s2) {
-        int n = s1.size(), m = s2.size();
-        if (n > m) {
-            return false;
+        int need = 0;
+        int cnt[26]{};
+        for (char c : s1) {
+            if (++cnt[c - 'a'] == 1) {
+                ++need;
+            }
         }
-        vector<int> cnt1(26), cnt2(26);
+        int m = s1.size(), n = s2.size();
         for (int i = 0; i < n; ++i) {
-            ++cnt1[s1[i] - 'a'];
-            ++cnt2[s2[i] - 'a'];
-        }
-        if (cnt1 == cnt2) {
-            return true;
-        }
-        for (int i = n; i < m; ++i) {
-            ++cnt2[s2[i] - 'a'];
-            --cnt2[s2[i - n] - 'a'];
-            if (cnt1 == cnt2) {
+            int c = s2[i] - 'a';
+            if (--cnt[c] == 0) {
+                --need;
+            }
+            if (i >= m) {
+                c = s2[i - m] - 'a';
+                if (++cnt[c] == 1) {
+                    ++need;
+                }
+            }
+            if (need == 0) {
                 return true;
             }
         }
         return false;
     }
-};
+};

solution/0500-0599/0567.Permutation in String/README_EN.md

@@ -0,0 +1,32 @@
+public class Solution {
+    public bool CheckInclusion(string s1, string s2) {
+        int need = 0;
+        int[] cnt = new int[26];
+
+        foreach (char c in s1) {
+            if (++cnt[c - 'a'] == 1) {
+                need++;
+            }
+        }
+
+        int m = s1.Length, n = s2.Length;
+        for (int i = 0; i < n; i++) {
+            int c = s2[i] - 'a';
+            if (--cnt[c] == 0) {
+                need--;
+            }
+
+            if (i >= m) {
+                c = s2[i - m] - 'a';
+                if (++cnt[c] == 1) {
+                    need++;
+                }
+            }
+
+            if (need == 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

solution/0500-0599/0567.Permutation in String/Solution.cpp

@@ -1,23 +1,28 @@
 func checkInclusion(s1 string, s2 string) bool {
-	n, m := len(s1), len(s2)
-	if n > m {
-		return false
-	}
-	cnt1 := [26]int{}
-	cnt2 := [26]int{}
-	for i := range s1 {
-		cnt1[s1[i]-'a']++
-		cnt2[s2[i]-'a']++
-	}
-	if cnt1 == cnt2 {
-		return true
+	need := 0
+	cnt := [26]int{}
+
+	for _, c := range s1 {
+		if cnt[c-'a']++; cnt[c-'a'] == 1 {
+			need++
+		}
 	}
-	for i := n; i < m; i++ {
-		cnt2[s2[i]-'a']++
-		cnt2[s2[i-n]-'a']--
-		if cnt1 == cnt2 {
+
+	m, n := len(s1), len(s2)
+	for i := 0; i < n; i++ {
+		c := s2[i] - 'a'
+		if cnt[c]--; cnt[c] == 0 {
+			need--
+		}
+		if i >= m {
+			c = s2[i-m] - 'a'
+			if cnt[c]++; cnt[c] == 1 {
+				need++
+			}
+		}
+		if need == 0 {
 			return true
 		}
 	}
 	return false
-}
+}

solution/0500-0599/0567.Permutation in String/Solution.cs

@@ -1,26 +1,28 @@
 class Solution {
     public boolean checkInclusion(String s1, String s2) {
-        int n = s1.length();
-        int m = s2.length();
-        if (n > m) {
-            return false;
+        int need = 0;
+        int[] cnt = new int[26];
+        for (char c : s1.toCharArray()) {
+            if (++cnt[c - 'a'] == 1) {
+                ++need;
+            }
         }
-        int[] cnt1 = new int[26];
-        int[] cnt2 = new int[26];
+        int m = s1.length(), n = s2.length();
         for (int i = 0; i < n; ++i) {
-            ++cnt1[s1.charAt(i) - 'a'];
-            ++cnt2[s2.charAt(i) - 'a'];
-        }
-        if (Arrays.equals(cnt1, cnt2)) {
-            return true;
-        }
-        for (int i = n; i < m; ++i) {
-            ++cnt2[s2.charAt(i) - 'a'];
-            --cnt2[s2.charAt(i - n) - 'a'];
-            if (Arrays.equals(cnt1, cnt2)) {
+            int c = s2.charAt(i) - 'a';
+            if (--cnt[c] == 0) {
+                --need;
+            }
+            if (i >= m) {
+                c = s2.charAt(i - m) - 'a';
+                if (++cnt[c] == 1) {
+                    ++need;
+                }
+            }
+            if (need == 0) {
                 return true;
             }
         }
         return false;
     }
-}
+}

solution/0500-0599/0567.Permutation in String/Solution.go

@@ -1,13 +1,16 @@
 class Solution:
     def checkInclusion(self, s1: str, s2: str) -> bool:
-        n = len(s1)
-        cnt1 = Counter(s1)
-        cnt2 = Counter(s2[:n])
-        if cnt1 == cnt2:
-            return True
-        for i in range(n, len(s2)):
-            cnt2[s2[i]] += 1
-            cnt2[s2[i - n]] -= 1
-            if cnt1 == cnt2:
+        cnt = Counter(s1)
+        need = len(cnt)
+        m = len(s1)
+        for i, c in enumerate(s2):
+            cnt[c] -= 1
+            if cnt[c] == 0:
+                need -= 1
+            if i >= m:
+                cnt[s2[i - m]] += 1
+                if cnt[s2[i - m]] == 1:
+                    need += 1
+            if need == 0:
                 return True
         return False

solution/0500-0599/0567.Permutation in String/Solution.java

@@ -1,46 +1,40 @@
-use std::collections::HashMap;
-
 impl Solution {
-    // 测试两个哈希表是否匹配
-    fn is_match(m1: &HashMap<char, i32>, m2: &HashMap<char, i32>) -> bool {
-        for (k, v) in m1.iter() {
-            if m2.get(k).unwrap_or(&0) != v {
-                return false;
-            }
-        }
-        true
-    }
     pub fn check_inclusion(s1: String, s2: String) -> bool {
-        if s1.len() > s2.len() {
-            return false;
-        }
-        let mut m1 = HashMap::new();
-        let mut m2 = HashMap::new();
-        // 初始化表 1
+        let mut need = 0;
+        let mut cnt = vec![0; 26];
+
         for c in s1.chars() {
-            m1.insert(c, m1.get(&c).unwrap_or(&0) + 1);
-        }
-        let cs: Vec<char> = s2.chars().collect();
-        // 初始化窗口
-        let mut i = 0;
-        while i < s1.len() {
-            m2.insert(cs[i], m2.get(&cs[i]).unwrap_or(&0) + 1);
-            i += 1;
-        }
-        if Self::is_match(&m1, &m2) {
-            return true;
+            let index = (c as u8 - b'a') as usize;
+            if cnt[index] == 0 {
+                need += 1;
+            }
+            cnt[index] += 1;
         }
-        // 持续滑动窗口，直到匹配或超出边界
-        let mut j = 0;
-        while i < cs.len() {
-            m2.insert(cs[j], m2.get(&cs[j]).unwrap_or(&1) - 1);
-            m2.insert(cs[i], m2.get(&cs[i]).unwrap_or(&0) + 1);
-            j += 1;
-            i += 1;
-            if Self::is_match(&m1, &m2) {
+
+        let m = s1.len();
+        let n = s2.len();
+        let s2_bytes = s2.as_bytes();
+
+        for i in 0..n {
+            let c = (s2_bytes[i] - b'a') as usize;
+            cnt[c] -= 1;
+            if cnt[c] == 0 {
+                need -= 1;
+            }
+
+            if i >= m {
+                let c = (s2_bytes[i - m] - b'a') as usize;
+                cnt[c] += 1;
+                if cnt[c] == 1 {
+                    need += 1;
+                }
+            }
+
+            if need == 0 {
                 return true;
             }
         }
+
         false
     }
 }

solution/0500-0599/0567.Permutation in String/Solution.py

@@ -1,43 +1,28 @@
 function checkInclusion(s1: string, s2: string): boolean {
-    // 滑动窗口方案
-    if (s1.length > s2.length) {
-        return false;
-    }
-
-    const n = s1.length;
-    const m = s2.length;
-
-    const toCode = (s: string) => s.charCodeAt(0) - 97;
-    const isMatch = () => {
-        for (let i = 0; i < 26; i++) {
-            if (arr1[i] !== arr2[i]) {
-                return false;
-            }
+    let need = 0;
+    const cnt: number[] = Array(26).fill(0);
+    const a = 'a'.charCodeAt(0);
+    for (const c of s1) {
+        if (++cnt[c.charCodeAt(0) - a] === 1) {
+            need++;
         }
-        return true;
-    };
-
-    const arr1 = new Array(26).fill(0);
-    for (const s of s1) {
-        const index = toCode(s);
-        arr1[index]++;
     }
 
-    const arr2 = new Array(26).fill(0);
+    const [m, n] = [s1.length, s2.length];
     for (let i = 0; i < n; i++) {
-        const index = toCode(s2[i]);
-        arr2[index]++;
-    }
-
-    for (let l = 0, r = n; r < m; l++, r++) {
-        if (isMatch()) {
+        let c = s2.charCodeAt(i) - a;
+        if (--cnt[c] === 0) {
+            need--;
+        }
+        if (i >= m) {
+            c = s2.charCodeAt(i - m) - a;
+            if (++cnt[c] === 1) {
+                need++;
+            }
+        }
+        if (need === 0) {
             return true;
         }
-
-        const i = toCode(s2[l]);
-        const j = toCode(s2[r]);
-        arr2[i]--;
-        arr2[j]++;
     }
-    return isMatch();
+    return false;
 }