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#include <bits/stdc++.h>
using namespace std;
void bangcuuchuong(long long n)
{
    for(long long i =0;i < 31;i++)
    {
        cout<<n<<" x "<<i<<" = "<<n*i<<"\n";
    }
}
int main()
{
    long long n;cin >>n;
    bangcuuchuong(n);
}

Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, or enum expected
#include <bits/stdc++.h>
         ^
Main.java:3: error: class, interface, or enum expected
void bangcuuchuong(long long n)
^
Main.java:5: error: class, interface, or enum expected
    for(long long i =0;i < 31;i++)
                       ^
Main.java:5: error: class, interface, or enum expected
    for(long long i =0;i < 31;i++)
                              ^
Main.java:8: error: class, interface, or enum expected
    }
    ^
Main.java:12: error: class, interface, or enum expected
    long long n;cin >>n;
                ^
Main.java:13: error: class, interface, or enum expected
    bangcuuchuong(n);
    ^
Main.java:14: error: class, interface, or enum expected
}
^
9 errors

Standard output is empty