foo.c:2:6: warning: return type of 'main' is not 'int' [-Wmain]
    2 | void main(){
      |      ^~~~
foo.c: In function 'main':
foo.c:4:1: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    4 | scanf("%d",&n);
      | ^~~~~~~~~~~~~~

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