/in/foo.cc: In function 'void tarjin1(int, int)':
/in/foo.cc:26:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(i=0;i<G[r].size();i++)
         ~^~~~~~~~~~~~
/in/foo.cc:37:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(i=0;i<trj[r].size();i++)
         ~^~~~~~~~~~~~~~
/in/foo.cc:24:7: warning: unused variable 'j' [-Wunused-variable]
 int i,j,k;
       ^
/in/foo.cc: In function 'void tarjin2(int, int)':
/in/foo.cc:58:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(i=0;i<G[r].size();i++)
         ~^~~~~~~~~~~~
/in/foo.cc:63:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for(i=0;i<trj[r].size();i++)
         ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:76:7: warning: unused variable 'j' [-Wunused-variable]
 int i,j,k=0,x,y,z,t=clock();
       ^
/in/foo.cc:76:9: warning: unused variable 'k' [-Wunused-variable]
 int i,j,k=0,x,y,z,t=clock();
         ^
/in/foo.cc:76:19: warning: unused variable 't' [-Wunused-variable]
 int i,j,k=0,x,y,z,t=clock();
                   ^