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Create Longest Valid Parentheses.cpp #209

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48 changes: 48 additions & 0 deletions Longest Valid Parentheses.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,48 @@
Longest Valid Parentheses

//code

class Solution {
public:
int longestValidParentheses(string s) {
int open=0, close=0;
int maxLen=0;

for(int i=0;i<s.size();i++){
if(s[i]=='('){
open++;
}
else{
close++;
}
if(open==close){
int len=open+close;
maxLen=max(maxLen,len);
}
else if(close>open){
close=0;
open=0;
}
}

open=0,close=0;

for(int i=s.size()-1;i>=0;i--){
if(s[i]=='('){
open++;
}
else{
close++;
}
if(open==close){
int len=open+close;
maxLen=max(maxLen,len);
}
else if(close<open){
close=0;
open=0;
}
}
return maxLen;
}
};