foo.cc:2:7: error: expected nested-name-specifier before 'namesapce'
    2 | using namesapce std;
      |       ^~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:6:27: error: expected ';' before '\U0000ff1b'
    6 |     printf("Hello World!")；
      |                           ^~
      |                           ;

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