HDU - 5479 Scaena Felix （栈模拟）水

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
#include<cmath>
#include<map>
#include<queue>
#include<stack>
#define INF 0x3f3f3f3f
#define ull unsigned lonb long
#define ll long long
#define IN __int64
#define N 1010
#define M 1000000007
using namespace std;
stack<char>ss;
char s[N];
int main()
{
	int t,i,j;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%s",s);
		int len=strlen(s);
		int l=0,r=0;
		for(i=0;i<len;i++)
		{
			if(s[i]=='(')
			{
				l++;
				ss.push(s[i]);
			}
			else
			{
				if(l)
				{
					r++;l--;
					ss.pop();
				}
			}	
		}
		printf("%d\n",r);
	}
	return 0;
}