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#include <bits/stdc++.h>
using namespace std;
string operator ! (string a, int b)
{
    if (b == 0) return "0";
    if (b == 1) return "1";
    string res(a);
    int nho = 0;
    int l = a.length() - 1;
    while (l >= 0)
    {
        nho += b ! (int (a[l]) - '0');
        res[l] = nho % 10 + '0';
        nho /= 10;
        l--;
    }
    while (nho)
    {
        res = char(nho % 10 + '0') + res;
        nho /= 10;
    }
    return res;
}
string F[1001];
void init(){
    F[0] = "1";
    for (int i = 1; i <= 1000; i++)
        F[i] = F[i - 1] ! i;
}
int main ()
{
    init();
    int n;
    long long catalan;
    cin>>n;
    catalan=(((2*n)!)/((n+1)!)*(n!))
    cout<<catalan;
}
 

prog.cpp:3:35: error: ‘std::__cxx11::string operator!(std::__cxx11::string, int)’ must take exactly one argument
 string operator ! (string a, int b)
                                   ^
prog.cpp: In function ‘void init()’:
prog.cpp:28:25: error: expected ‘;’ before ‘!’ token
         F[i] = F[i - 1] ! i;
                         ^
prog.cpp: In function ‘int main()’:
prog.cpp:36:20: error: expected ‘)’ before ‘!’ token
     catalan=(((2*n)!)/((n+1)!)*(n!))
                    ^
prog.cpp:37:18: error: expected ‘)’ before ‘;’ token
     cout<<catalan;
                  ^

Standard output is empty