Commit 79db69e

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feat: add cs solution to lc problem: No.1930 (#1964)

* feat: add cs solution to lc problem: No.1930 * Update README_EN.md to lc problem: No.1930 * Update README.md to lc problem: No.1930

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Original file line number	Diff line number	Diff line change
`@@ -144,6 +144,25 @@ func countPalindromicSubsequence(s string) (ans int) {`
`144`	`144`	`}`
`145`	`145`	```
`146`	`146`
	`147`	`+### C#`
	`148`	`+`
	`149`	+```cs
	`150`	`+public class Solution {`
	`151`	`+ public int CountPalindromicSubsequence(string s) {`
	`152`	`+ int ans = 0;`
	`153`	`+ for (char c = 'a'; c <= 'z'; ++c) {`
	`154`	`+ int l = s.IndexOf(c), r = s.LastIndexOf(c);`
	`155`	`+ HashSet<char> cs = new HashSet<char>();`
	`156`	`+ for (int i = l + 1; i < r; ++i) {`
	`157`	`+ cs.Add(s[i]);`
	`158`	`+ }`
	`159`	`+ ans += cs.Count;`
	`160`	`+ }`
	`161`	`+ return ans;`
	`162`	`+ }`
	`163`	`+}`
	`164`	+```
	`165`	`+`
`147`	`166`	`### ...`
`148`	`167`
`149`	`168`	```

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Original file line number	Diff line number	Diff line change
`@@ -126,6 +126,25 @@ func countPalindromicSubsequence(s string) (ans int) {`
`126`	`126`	`}`
`127`	`127`	```
`128`	`128`
	`129`	`+### C#`
	`130`	`+`
	`131`	+```cs
	`132`	`+public class Solution {`
	`133`	`+ public int CountPalindromicSubsequence(string s) {`
	`134`	`+ int ans = 0;`
	`135`	`+ for (char c = 'a'; c <= 'z'; ++c) {`
	`136`	`+ int l = s.IndexOf(c), r = s.LastIndexOf(c);`
	`137`	`+ HashSet<char> cs = new HashSet<char>();`
	`138`	`+ for (int i = l + 1; i < r; ++i) {`
	`139`	`+ cs.Add(s[i]);`
	`140`	`+ }`
	`141`	`+ ans += cs.Count;`
	`142`	`+ }`
	`143`	`+ return ans;`
	`144`	`+ }`
	`145`	`+}`
	`146`	+```
	`147`	`+`
`129`	`148`	`### ...`
`130`	`149`
`131`	`150`	```

Lines changed: 14 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,14 @@`
	`1`	`+public class Solution {`
	`2`	`+ public int CountPalindromicSubsequence(string s) {`
	`3`	`+ int ans = 0;`
	`4`	`+ for (char c = 'a'; c <= 'z'; ++c) {`
	`5`	`+ int l = s.IndexOf(c), r = s.LastIndexOf(c);`
	`6`	`+ HashSet<char> cs = new HashSet<char>();`
	`7`	`+ for (int i = l + 1; i < r; ++i) {`
	`8`	`+ cs.Add(s[i]);`
	`9`	`+ }`
	`10`	`+ ans += cs.Count;`
	`11`	`+ }`
	`12`	`+ return ans;`
	`13`	`+ }`
	`14`	`+}`

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