foo.c:1:1: warning: data definition has no type or storage class
    1 | s=0
      | ^
foo.c:1:1: warning: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
foo.c:2:1: error: expected ',' or ';' before 'for'
    2 | for i in range(1,n+1)
      | ^~~

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