foo.cc: In function ‘int main()’:
foo.cc:7:13: error: expected ‘(’ before ‘（int’
    7 |         for （int i=1;i<=2*n-1;i++）
      |             ^~~~~
      |             (
foo.cc:7:13: error: ‘（int’ was not declared in this scope
    7 |         for （int i=1;i<=2*n-1;i++）
      |             ^~~~~
foo.cc:7:23: error: ‘i’ was not declared in this scope
    7 |         for （int i=1;i<=2*n-1;i++）
      |                       ^
foo.cc:7:35: error: expected ‘)’ before ‘）’
    7 |         for （int i=1;i<=2*n-1;i++）
      |             ~~~~~                 ^~
      |                                   )
foo.cc:7:35: error: ‘）’ was not declared in this scope
    7 |         for （int i=1;i<=2*n-1;i++）
      |                                   ^~