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Leetcode32.cpp
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121 lines (100 loc) · 2.92 KB
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// Leetcode32.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <string>
#include <vector>
using namespace::std;
int longestValidParentheses(string s)
{
int maxLenth = 0;
int balance = 0;
int front = -1, back = -1;
int lastLenth = 0, tempLenth = 0;
for (int i = 0; i < s.size(); ++i)
{
if ('(' == s[i])
{
++balance;
if (-1 == front)
front = i;
back = i;
}
else //s[i] = ')'
{
--balance;
if (!balance)
{
back = i;
tempLenth = back - front + 1;
maxLenth = max(maxLenth, lastLenth + tempLenth);
lastLenth = lastLenth + tempLenth;
front = -1;
back = -1;
}
else if (balance > 0)
{
back = i;
int localBalance = 0;
for (int j = back; j >= 0; --j)
{
if (')' == s[j])
++localBalance;
else
{
--localBalance;
if (!localBalance)
maxLenth = max(maxLenth, back - j + 1);
else if (localBalance < 0)
break;
}
}
}
else //balance < 0
{
front = -1;
back = -1;
balance = 0;
lastLenth = 0;
}
}
}
return maxLenth;
}
int longestValidParenthesesBetter(string s)
{
int maxLength = 0;
vector<int> vi;
vi.push_back(-1);
for (int i = 0; i < s.size(); ++i)
{
if ('(' == s[i])
{
vi.push_back(i);
}
if (')' == s[i])
{
vi.pop_back();
if (!vi.size())
vi.push_back(i);
else
maxLength = max(maxLength, i - vi.back());
}
}
return maxLength;
}
int main()
{
string s = "((((()())()()))()(()))";
//int res = longestValidParentheses(s);
int res = longestValidParenthesesBetter(s);
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file