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Create GenerateParentheses.java #21

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Create GenerateParentheses.java #21

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26 changes: 26 additions & 0 deletions GenerateParentheses.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
class Solution {
List<String> ans = new ArrayList<>();
public void helper(String s, int open, int close, int n)
{
if(s.length()==2*n)
{
ans.add(s);
return;
}
if(open<n)
{
helper(s+'(', open+1,close,n);
}
if(close<open)
{
helper(s+')', open, close+1, n);
}
}

public List<String> generateParenthesis(int n) {
if(n==0)
return ans;
helper("",0,0,n);
return ans;
}
}