foo.cc: In function 'int main()':
foo.cc:20:20: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   20 |   for(j=i+1;j*(i+j)<=n;j++){
      |             ~~~~~~~^~~
foo.cc:23:21: warning: comparison of integer expressions of different signedness: 'int' and 'll' {aka 'long long unsigned int'} [-Wsign-compare]
   23 |    for(k=1;k*j*(i+j)<=n;k++)
      |            ~~~~~~~~~^~~
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  scanf("%lld",&n);
      |  ~~~~~^~~~~~~~~~~

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