Bracket Sequences Concatenation Problem(括号配对)

#include
using namespace std;
typedef long long ll;
const int maxn=3e5+10;
int q[maxn];
vectorV;
int main()
{
    int n;
    scanf("%d",&n);
    for(int i=0;i>s;
        int len=s.size(),t,tmp;
        tmp=t=0;
        for(int j=0;j

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