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Commit 8e777ff

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feat: add solutions to lc problem: No.0269 (doocs#4441)
No.0269.Alien Dictionary
1 parent aca2202 commit 8e777ff

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3 files changed

+238
-0
lines changed

3 files changed

+238
-0
lines changed

‎solution/0200-0299/0269.Alien Dictionary/README.md‎

Lines changed: 81 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -288,6 +288,87 @@ public:
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};
289289
```
290290
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#### Go
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```go
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func alienOrder(words []string) string {
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g := [26][26]bool{}
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s := [26]bool{}
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cnt := 0
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n := len(words)
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for i := 0; i < n-1; i++ {
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for _, c := range words[i] {
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if cnt == 26 {
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break
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}
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c -= 'a'
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if !s[c] {
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cnt++
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s[c] = true
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}
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}
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m := len(words[i])
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for j := 0; j < m; j++ {
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if j >= len(words[i+1]) {
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return ""
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}
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c1, c2 := words[i][j]-'a', words[i+1][j]-'a'
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if c1 == c2 {
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continue
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}
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if g[c2][c1] {
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return ""
321+
}
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g[c1][c2] = true
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break
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}
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}
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for _, c := range words[n-1] {
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if cnt == 26 {
328+
break
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}
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c -= 'a'
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if !s[c] {
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cnt++
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s[c] = true
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}
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}
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inDegree := [26]int{}
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for _, out := range g {
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for i, v := range out {
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if v {
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inDegree[i]++
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}
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}
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}
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q := []int{}
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for i, in := range inDegree {
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if in == 0 && s[i] {
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q = append(q, i)
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}
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}
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ans := ""
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for len(q) > 0 {
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t := q[0]
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q = q[1:]
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ans += string(t + 'a')
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for i, v := range g[t] {
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if v {
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inDegree[i]--
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if inDegree[i] == 0 && s[i] {
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q = append(q, i)
361+
}
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}
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}
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}
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if len(ans) < cnt {
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return ""
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}
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return ans
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}
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```
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291372
<!-- tabs:end -->
292373

293374
<!-- solution:end -->

‎solution/0200-0299/0269.Alien Dictionary/README_EN.md‎

Lines changed: 81 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -269,6 +269,87 @@ public:
269269
};
270270
```
271271
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#### Go
273+
274+
```go
275+
func alienOrder(words []string) string {
276+
g := [26][26]bool{}
277+
s := [26]bool{}
278+
cnt := 0
279+
n := len(words)
280+
for i := 0; i < n-1; i++ {
281+
for _, c := range words[i] {
282+
if cnt == 26 {
283+
break
284+
}
285+
c -= 'a'
286+
if !s[c] {
287+
cnt++
288+
s[c] = true
289+
}
290+
}
291+
m := len(words[i])
292+
for j := 0; j < m; j++ {
293+
if j >= len(words[i+1]) {
294+
return ""
295+
}
296+
c1, c2 := words[i][j]-'a', words[i+1][j]-'a'
297+
if c1 == c2 {
298+
continue
299+
}
300+
if g[c2][c1] {
301+
return ""
302+
}
303+
g[c1][c2] = true
304+
break
305+
}
306+
}
307+
for _, c := range words[n-1] {
308+
if cnt == 26 {
309+
break
310+
}
311+
c -= 'a'
312+
if !s[c] {
313+
cnt++
314+
s[c] = true
315+
}
316+
}
317+
318+
inDegree := [26]int{}
319+
for _, out := range g {
320+
for i, v := range out {
321+
if v {
322+
inDegree[i]++
323+
}
324+
}
325+
}
326+
q := []int{}
327+
for i, in := range inDegree {
328+
if in == 0 && s[i] {
329+
q = append(q, i)
330+
}
331+
}
332+
ans := ""
333+
for len(q) > 0 {
334+
t := q[0]
335+
q = q[1:]
336+
ans += string(t + 'a')
337+
for i, v := range g[t] {
338+
if v {
339+
inDegree[i]--
340+
if inDegree[i] == 0 && s[i] {
341+
q = append(q, i)
342+
}
343+
}
344+
}
345+
}
346+
if len(ans) < cnt {
347+
return ""
348+
}
349+
return ans
350+
}
351+
```
352+
272353
<!-- tabs:end -->
273354

274355
<!-- solution:end -->
Lines changed: 76 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,76 @@
1+
func alienOrder(words []string) string {
2+
g := [26][26]bool{}
3+
s := [26]bool{}
4+
cnt := 0
5+
n := len(words)
6+
for i := 0; i < n-1; i++ {
7+
for _, c := range words[i] {
8+
if cnt == 26 {
9+
break
10+
}
11+
c -= 'a'
12+
if !s[c] {
13+
cnt++
14+
s[c] = true
15+
}
16+
}
17+
m := len(words[i])
18+
for j := 0; j < m; j++ {
19+
if j >= len(words[i+1]) {
20+
return ""
21+
}
22+
c1, c2 := words[i][j]-'a', words[i+1][j]-'a'
23+
if c1 == c2 {
24+
continue
25+
}
26+
if g[c2][c1] {
27+
return ""
28+
}
29+
g[c1][c2] = true
30+
break
31+
}
32+
}
33+
for _, c := range words[n-1] {
34+
if cnt == 26 {
35+
break
36+
}
37+
c -= 'a'
38+
if !s[c] {
39+
cnt++
40+
s[c] = true
41+
}
42+
}
43+
44+
inDegree := [26]int{}
45+
for _, out := range g {
46+
for i, v := range out {
47+
if v {
48+
inDegree[i]++
49+
}
50+
}
51+
}
52+
q := []int{}
53+
for i, in := range inDegree {
54+
if in == 0 && s[i] {
55+
q = append(q, i)
56+
}
57+
}
58+
ans := ""
59+
for len(q) > 0 {
60+
t := q[0]
61+
q = q[1:]
62+
ans += string(t + 'a')
63+
for i, v := range g[t] {
64+
if v {
65+
inDegree[i]--
66+
if inDegree[i] == 0 && s[i] {
67+
q = append(q, i)
68+
}
69+
}
70+
}
71+
}
72+
if len(ans) < cnt {
73+
return ""
74+
}
75+
return ans
76+
}

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