foo.cc: In function 'int main()':
foo.cc:25:24: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
   scanf("%d", &arr[i].u);
               ~~~~~~~~~^
foo.cc:27:24: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long int*' [-Wformat=]
   scanf("%d", &arr[i].v);
               ~~~~~~~~~^
foo.cc:40:54: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long int' [-Wformat=]
   printf("%d\n", max(ans[i-1]+sum[i],ans[i]+tot[i]*2));
                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
foo.cc:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i].u);
   ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &arr[i].v);
   ~~~~~^~~~~~~~~~~~~~~~~

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-07-11T06:39:56.457Z","handle":"2020-07-11T06:39:56.457Z","cache_start":"2020-07-11T06:39:56.463Z","read_cases":"2020-07-11T06:39:56.612Z","judge":"2020-07-11T06:39:56.615Z","done":"2020-07-11T06:39:57.207Z"}