foo.cc: In function 'int main()':
foo.cc:7:9: warning: unused variable 'tmp' [-Wunused-variable]
     int tmp = 0;
         ^~~
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
foo.cc:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&x[i]);
         ~~~~~^~~~~~~~~~~~

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