foo.cc: In function 'int main()':
foo.cc:9:73: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
       printf("%I64d",(long long)m*(long long)m+(long long)n*(long long)n);
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
foo.cc:4:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&k);
         ~~~~~^~~~~~~~~

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