Commit ac351c1

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Merge pull request #3 from Megha1209/patch-1

Create lc940 java

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	`1`	`+ public static int distinctSubseqII(String S) {`
	`2`	`+ int[] dp=new int[S.length()+1];`
	`3`	`+ int[] lastSeen=new int[26];`
	`4`	`+ dp[0]=1;`
	`5`	`+ int mod=(int)1e9+7;`
	`6`	`+`
	`7`	`+ for(int i=1;i<dp.length();i++){`
	`8`	`+ dp[i] = (dp[i-1] * 2) % mod;`
	`9`	`+`
	`10`	`+ int idx=S.charAt(i-1)-'a';`
	`11`	`+ if(lastSeen[idx]!=0)`
	`12`	`+ dp[i] -= dp[lastSeen[idx]-1];`
	`13`	`+`
	`14`	`+ dp[i]%=mod;`
	`15`	`+ lastSeen[idx]=i;`
	`16`	`+ }`
	`17`	`+`
	`18`	`+ int ans = --dp[S.length()];`
	`19`	`+ if(ans<0) ans+=mod;`
	`20`	`+ return ans;`
	`21`	`+ }`

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