acm 编译错误，求大神。。。。。c++

#include
#include
#include
using namespace std;
void check(string a){
int cnt_index=0,cnt_int=0;
for(unsigned j=0;j if(a[j]>='0'&&a[j]<='9'){
cnt_int*=10;
cnt_int+=a[j]-'0';
}
else{
if(cnt_int==0){
cnt_int=1;
}
cnt_index=j;
for(int i=0;i<cnt_int;i++){
j=cnt_index;
if(a[j]!='('&&a[j]!=')'){
cout<<a[j];
}
else{
j++;
string c;int nleft=1,nright=0;
while(nleft!=nright){
if(a[j]=='('){
nleft++;
}
if(a[j]==')'){
nright++;
}
if(nleft!=nright){
stringstream stream;
stream << a[j];
c += stream.str();
j++;
}

                 }
             check(c);
             }
         }
         cnt_int=0;
     }
}

}
int main(){
int n;
cin>>n;
string *a=new string[n];
for(int i=0;i cin>>a[i];
}
for(int i=0;i<n;i++){
check(a[i]);
cout<<endl;
}
return 0;
}

 #include<iostream >，多了一个空格