/in/foo.cc: In function 'int main()':
/in/foo.cc:76:9: warning: unused variable 't1' [-Wunused-variable]
     int t1=0,t2=0,add=0;
         ^~
/in/foo.cc:76:14: warning: unused variable 't2' [-Wunused-variable]
     int t1=0,t2=0,add=0;
              ^~