括号配对问题

#include <stdio.h>  #include <string.h>  #include <stack>  using namespace std;  stack <char> Q;  char s[11000];  int main()  {      int T,i;      Q.push('#');      scanf("%d",&T);      while(T--)      {          scanf("%s",s);          int len=strlen(s);          if(len%2!=0)              printf("No\n");          else          {              for(i=0;i<len;i++)              {                  if(s[i]=='[' || s[i]=='(')                      Q.push(s[i]);                  else if((s[i]==']' && Q.top()=='[') || (s[i]==')' && Q.top()=='('))                      Q.pop();                  else                      Q.push(s[i]);              }              if(Q.top()=='#')                  printf("Yes\n");              else                  printf("No\n");              while(Q.top()!='#')                  Q.pop();          }      }      return 0;  }