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feat: add solutions to lc problems: No.0290,0645,0763,2042+
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‎solution/0200-0299/0290.Word Pattern/README.md‎

Lines changed: 68 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -33,7 +33,6 @@
3333
<p><strong>说明:</strong><br>
3434
你可以假设&nbsp;<code>pattern</code>&nbsp;只包含小写字母，&nbsp;<code>str</code>&nbsp;包含了由单个空格分隔的小写字母。&nbsp; &nbsp;&nbsp;</p>
3535

36-
3736
## 解法
3837

3938
<!-- 这里可写通用的实现逻辑 -->
@@ -47,18 +46,18 @@
4746
```python
4847
class Solution:
4948
def wordPattern(self, pattern: str, s: str) -> bool:
50-
ch2str, str2ch = {}, {}
51-
ss = s.split(' ')
49+
s = s.split(' ')
5250
n = len(pattern)
53-
if n != len(ss):
51+
if n != len(s):
5452
return False
53+
c2str, str2c = collections.defaultdict(), collections.defaultdict()
5554
for i in range(n):
56-
if ch2str.get(pattern[i]) is not None and ch2str.get(pattern[i]) != ss[i]:
55+
k, v = pattern[i], s[i]
56+
if k in c2str and c2str[k] != v:
5757
return False
58-
if str2ch.get(ss[i]) is not None and str2ch.get(ss[i]) != pattern[i]:
58+
if v in str2c and str2c[v] != k:
5959
return False
60-
ch2str[pattern[i]] = ss[i]
61-
str2ch[ss[i]] = pattern[i]
60+
c2str[k], str2c[v] = v, k
6261
return True
6362
```
6463

@@ -69,23 +68,24 @@ class Solution:
6968
```java
7069
class Solution {
7170
public boolean wordPattern(String pattern, String s) {
72-
Map<Character, String> ch2str = new HashMap<>();
73-
Map<String, Character> str2ch = new HashMap<>();
7471
String[] ss = s.split(" ");
7572
int n = pattern.length();
7673
if (n != ss.length) {
7774
return false;
7875
}
76+
Map<Character, String> c2str = new HashMap<>();
77+
Map<String, Character> str2c = new HashMap<>();
7978
for (int i = 0; i < n; ++i) {
80-
char ch = pattern.charAt(i);
81-
if (ch2str.containsKey(ch) && !ch2str.get(ch).equals(ss[i])) {
79+
char k = pattern.charAt(i);
80+
String v = ss[i];
81+
if (c2str.containsKey(k) && !Objects.equals(c2str.get(k), v)) {
8282
return false;
8383
}
84-
if (str2ch.containsKey(ss[i]) && !str2ch.get(ss[i]).equals(ch)) {
84+
if (str2c.containsKey(v) && !Objects.equals(str2c.get(v), k)) {
8585
return false;
8686
}
87-
ch2str.put(ch, ss[i]);
88-
str2ch.put(ss[i], ch);
87+
c2str.put(k, v);
88+
str2c.put(v, k);
8989
}
9090
return true;
9191
}
@@ -113,6 +113,59 @@ function wordPattern(pattern: string, s: string): boolean {
113113
};
114114
```
115115

116+
### **C++**
117+
118+
```cpp
119+
class Solution {
120+
public:
121+
bool wordPattern(string pattern, string s) {
122+
istringstream is(s);
123+
vector<string> ss;
124+
while (is >> s) ss.push_back(s);
125+
int n = pattern.size();
126+
if (n != ss.size()) return false;
127+
128+
unordered_map<char, string> c2str;
129+
unordered_map<string, char> str2c;
130+
for (int i = 0; i < n; ++i)
131+
{
132+
char k = pattern[i];
133+
string v = ss[i];
134+
if (c2str.count(k) && c2str[k] != v) return false;
135+
if (str2c.count(v) && str2c[v] != k) return false;
136+
c2str[k] = v;
137+
str2c[v] = k;
138+
}
139+
return true;
140+
}
141+
};
142+
```
143+
144+
### **Go**
145+
146+
```go
147+
func wordPattern(pattern string, s string) bool {
148+
ss := strings.Split(s, " ")
149+
n := len(pattern)
150+
if n != len(ss) {
151+
return false
152+
}
153+
c2str := make(map[byte]string)
154+
str2c := make(map[string]byte)
155+
for i := 0; i < n; i++ {
156+
k, v := pattern[i], ss[i]
157+
if c2str[k] != "" && c2str[k] != v {
158+
return false
159+
}
160+
if str2c[v] > 0 && str2c[v] != k {
161+
return false
162+
}
163+
c2str[k], str2c[v] = v, k
164+
}
165+
return true
166+
}
167+
```
168+
116169
### **...**
117170

118171
```

‎solution/0200-0299/0290.Word Pattern/README_EN.md‎

Lines changed: 68 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -59,18 +59,18 @@
5959
```python
6060
class Solution:
6161
def wordPattern(self, pattern: str, s: str) -> bool:
62-
ch2str, str2ch = {}, {}
63-
ss = s.split(' ')
62+
s = s.split(' ')
6463
n = len(pattern)
65-
if n != len(ss):
64+
if n != len(s):
6665
return False
66+
c2str, str2c = collections.defaultdict(), collections.defaultdict()
6767
for i in range(n):
68-
if ch2str.get(pattern[i]) is not None and ch2str.get(pattern[i]) != ss[i]:
68+
k, v = pattern[i], s[i]
69+
if k in c2str and c2str[k] != v:
6970
return False
70-
if str2ch.get(ss[i]) is not None and str2ch.get(ss[i]) != pattern[i]:
71+
if v in str2c and str2c[v] != k:
7172
return False
72-
ch2str[pattern[i]] = ss[i]
73-
str2ch[ss[i]] = pattern[i]
73+
c2str[k], str2c[v] = v, k
7474
return True
7575
```
7676

@@ -79,23 +79,24 @@ class Solution:
7979
```java
8080
class Solution {
8181
public boolean wordPattern(String pattern, String s) {
82-
Map<Character, String> ch2str = new HashMap<>();
83-
Map<String, Character> str2ch = new HashMap<>();
8482
String[] ss = s.split(" ");
8583
int n = pattern.length();
8684
if (n != ss.length) {
8785
return false;
8886
}
87+
Map<Character, String> c2str = new HashMap<>();
88+
Map<String, Character> str2c = new HashMap<>();
8989
for (int i = 0; i < n; ++i) {
90-
char ch = pattern.charAt(i);
91-
if (ch2str.containsKey(ch) && !ch2str.get(ch).equals(ss[i])) {
90+
char k = pattern.charAt(i);
91+
String v = ss[i];
92+
if (c2str.containsKey(k) && !Objects.equals(c2str.get(k), v)) {
9293
return false;
9394
}
94-
if (str2ch.containsKey(ss[i]) && !str2ch.get(ss[i]).equals(ch)) {
95+
if (str2c.containsKey(v) && !Objects.equals(str2c.get(v), k)) {
9596
return false;
9697
}
97-
ch2str.put(ch, ss[i]);
98-
str2ch.put(ss[i], ch);
98+
c2str.put(k, v);
99+
str2c.put(v, k);
99100
}
100101
return true;
101102
}
@@ -123,6 +124,59 @@ function wordPattern(pattern: string, s: string): boolean {
123124
};
124125
```
125126

127+
### **C++**
128+
129+
```cpp
130+
class Solution {
131+
public:
132+
bool wordPattern(string pattern, string s) {
133+
istringstream is(s);
134+
vector<string> ss;
135+
while (is >> s) ss.push_back(s);
136+
int n = pattern.size();
137+
if (n != ss.size()) return false;
138+
139+
unordered_map<char, string> c2str;
140+
unordered_map<string, char> str2c;
141+
for (int i = 0; i < n; ++i)
142+
{
143+
char k = pattern[i];
144+
string v = ss[i];
145+
if (c2str.count(k) && c2str[k] != v) return false;
146+
if (str2c.count(v) && str2c[v] != k) return false;
147+
c2str[k] = v;
148+
str2c[v] = k;
149+
}
150+
return true;
151+
}
152+
};
153+
```
154+
155+
### **Go**
156+
157+
```go
158+
func wordPattern(pattern string, s string) bool {
159+
ss := strings.Split(s, " ")
160+
n := len(pattern)
161+
if n != len(ss) {
162+
return false
163+
}
164+
c2str := make(map[byte]string)
165+
str2c := make(map[string]byte)
166+
for i := 0; i < n; i++ {
167+
k, v := pattern[i], ss[i]
168+
if c2str[k] != "" && c2str[k] != v {
169+
return false
170+
}
171+
if str2c[v] > 0 && str2c[v] != k {
172+
return false
173+
}
174+
c2str[k], str2c[v] = v, k
175+
}
176+
return true
177+
}
178+
```
179+
126180
### **...**
127181

128182
```

‎solution/0200-0299/0290.Word Pattern/Solution.cpp‎

Lines changed: 23 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,23 @@
1+
class Solution {
2+
public:
3+
bool wordPattern(string pattern, string s) {
4+
istringstream is(s);
5+
vector<string> ss;
6+
while (is >> s) ss.push_back(s);
7+
int n = pattern.size();
8+
if (n != ss.size()) return false;
9+
10+
unordered_map<char, string> c2str;
11+
unordered_map<string, char> str2c;
12+
for (int i = 0; i < n; ++i)
13+
{
14+
char k = pattern[i];
15+
string v = ss[i];
16+
if (c2str.count(k) && c2str[k] != v) return false;
17+
if (str2c.count(v) && str2c[v] != k) return false;
18+
c2str[k] = v;
19+
str2c[v] = k;
20+
}
21+
return true;
22+
}
23+
};

‎solution/0200-0299/0290.Word Pattern/Solution.go‎

Lines changed: 20 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,20 @@
1+
func wordPattern(pattern string, s string) bool {
2+
ss := strings.Split(s, " ")
3+
n := len(pattern)
4+
if n != len(ss) {
5+
return false
6+
}
7+
c2str := make(map[byte]string)
8+
str2c := make(map[string]byte)
9+
for i := 0; i < n; i++ {
10+
k, v := pattern[i], ss[i]
11+
if c2str[k] != "" && c2str[k] != v {
12+
return false
13+
}
14+
if str2c[v] > 0 && str2c[v] != k {
15+
return false
16+
}
17+
c2str[k], str2c[v] = v, k
18+
}
19+
return true
20+
}

‎solution/0200-0299/0290.Word Pattern/Solution.java‎

Lines changed: 8 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1,22 +1,23 @@
11
class Solution {
22
public boolean wordPattern(String pattern, String s) {
3-
Map<Character, String> ch2str = new HashMap<>();
4-
Map<String, Character> str2ch = new HashMap<>();
53
String[] ss = s.split(" ");
64
int n = pattern.length();
75
if (n != ss.length) {
86
return false;
97
}
8+
Map<Character, String> c2str = new HashMap<>();
9+
Map<String, Character> str2c = new HashMap<>();
1010
for (int i = 0; i < n; ++i) {
11-
char ch = pattern.charAt(i);
12-
if (ch2str.containsKey(ch) && !ch2str.get(ch).equals(ss[i])) {
11+
char k = pattern.charAt(i);
12+
String v = ss[i];
13+
if (c2str.containsKey(k) && !Objects.equals(c2str.get(k), v)) {
1314
return false;
1415
}
15-
if (str2ch.containsKey(ss[i]) && !str2ch.get(ss[i]).equals(ch)) {
16+
if (str2c.containsKey(v) && !Objects.equals(str2c.get(v), k)) {
1617
return false;
1718
}
18-
ch2str.put(ch, ss[i]);
19-
str2ch.put(ss[i], ch);
19+
c2str.put(k, v);
20+
str2c.put(v, k);
2021
}
2122
return true;
2223
}

‎solution/0200-0299/0290.Word Pattern/Solution.py‎

Lines changed: 7 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -1,15 +1,15 @@
11
class Solution:
22
def wordPattern(self, pattern: str, s: str) -> bool:
3-
ch2str, str2ch = {}, {}
4-
ss = s.split(' ')
3+
s = s.split(' ')
54
n = len(pattern)
6-
if n != len(ss):
5+
if n != len(s):
76
return False
7+
c2str, str2c = collections.defaultdict(), collections.defaultdict()
88
for i in range(n):
9-
if ch2str.get(pattern[i]) is not None and ch2str.get(pattern[i]) != ss[i]:
9+
k, v = pattern[i], s[i]
10+
if k in c2str and c2str[k] != v:
1011
return False
11-
if str2ch.get(ss[i]) is not None and str2ch.get(ss[i]) != pattern[i]:
12+
if v in str2c and str2c[v] != k:
1213
return False
13-
ch2str[pattern[i]] = ss[i]
14-
str2ch[ss[i]] = pattern[i]
14+
c2str[k], str2c[v] = v, k
1515
return True

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