foo.cc: In function 'int main()':
foo.cc:4:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b,c,n,m,t,s=0;
      ^
foo.cc:4:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b,c,n,m,t,s=0;
        ^
foo.cc:4:10: warning: unused variable 'c' [-Wunused-variable]
  int a,b,c,n,m,t,s=0;
          ^
foo.cc:4:14: warning: unused variable 'm' [-Wunused-variable]
  int a,b,c,n,m,t,s=0;
              ^
foo.cc:4:16: warning: unused variable 't' [-Wunused-variable]
  int a,b,c,n,m,t,s=0;
                ^

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