| Parentheses Balance |
You are given a string consisting of parentheses () and []. A string of this type is said to becorrect:
Write a program that takes a sequence of strings of this type and check their correctness. Your program can assume that the maximum string length is 128.
3 ([]) (([()]))) ([()[]()])()
Yes No Yes
#include <cstdio>
#include <iostream>
#include <cstring>
#include <stack>
using namespace std;
const int MAX = 150;
stack<char> s;
string buff;
int n;
bool find(char ch)
{
if(s.empty())
return false;
if(ch==‘)‘)
{
if(s.top()==‘(‘)
{
s.pop();
return true;
}
return false;
}else if(ch==‘]‘){
if(s.top()==‘[‘)
{
s.pop();
return true;
}
return false;
}
}
void solve()
{
int length = buff.size();
bool ans=true;
for(int i=0; i < length; i++)
{
if(buff[i]==‘(‘
|| buff[i]==‘[‘)
s.push(buff[i]);
else
{
if(!find(buff[i])){
ans = false;
break;
}
}
}
if(ans && s.empty())
printf("Yes\n");
else
printf("No\n");
}
void init()
{
while(!s.empty())
s.pop();
}
void read()
{
cin>>n;
cin.get();
while(n--)
{
init();
getline(cin, buff);
solve();
}
}
int main()
{
// freopen("in.txt","r",stdin);
read();
return 0;
}UVa 673 - Parentheses Balance,布布扣,bubuko.com
原文:http://blog.csdn.net/china_zoujinyong/article/details/20719605