有效的括號序列
阿新 • • 發佈：2019-01-31
class
Solution {
public:
/**
* @param s A string
* @return whether the string is a valid parentheses
*/
bool isValidParentheses(string& s) {
if(s.length()==0||s.length()%2!=0)
{ return false; }
stack<char> S;
for(int i=0;i<s.length();i++)
{ if(s[i]=='('||s[i]=='['||s[i]=='{')
{ S.push(s[i]); }
else if(s[i]==')')
{if(!S.empty()&&S.top()=='(')
{S.pop();}
else
{return false;
break;}
}
else if(s[i]==']')
{if(!S.empty()&&S.top()=='[')
{S.pop();}
else
{return false;
break;}
}
else if(s[i]=='}')
{if(!S.empty()&&S.top()=='{')
{S.pop();}
else
{return false;
break;}
}
}
if(!S.empty())
{return false;}// Write your code here
}
};
public:
/**
* @param s A string
* @return whether the string is a valid parentheses
*/
bool isValidParentheses(string& s) {
if(s.length()==0||s.length()%2!=0)
{ return false; }
stack<char> S;
for(int i=0;i<s.length();i++)
{ if(s[i]=='('||s[i]=='['||s[i]=='{')
{ S.push(s[i]); }
else if(s[i]==')')
{if(!S.empty()&&S.top()=='(')
{S.pop();}
else
{return false;
break;}
}
else if(s[i]==']')
{if(!S.empty()&&S.top()=='[')
{S.pop();}
else
{return false;
break;}
}
else if(s[i]=='}')
{if(!S.empty()&&S.top()=='{')
{S.pop();}
else
{return false;
break;}
}
}
if(!S.empty())
{return false;}// Write your code here
}
};