foo.cpp: In function 'int main()':
foo.cpp:4:4: error: 'ios' has not been declared
    ios::sync_with_stdio(false);
    ^~~
foo.cpp:5:18: error: 'cin' was not declared in this scope
    long long n,p;cin>>n>>p;
                  ^~~
foo.cpp:5:18: note: suggested alternative:
In file included from C:/mingw32/lib/gcc/i686-w64-mingw32/6.3.0/include/c++/i686-w64-mingw32/bits/stdc++.h:75:0,
                 from foo.cpp:1:
C:/mingw32/lib/gcc/i686-w64-mingw32/6.3.0/include/c++/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
foo.cpp:6:4: error: 'cout' was not declared in this scope
    cout<<(n-1)%p;
    ^~~~
foo.cpp:6:4: note: suggested alternative:
In file included from C:/mingw32/lib/gcc/i686-w64-mingw32/6.3.0/include/c++/i686-w64-mingw32/bits/stdc++.h:75:0,
                 from foo.cpp:1:
C:/mingw32/lib/gcc/i686-w64-mingw32/6.3.0/include/c++/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~