/in/foo.cc: In function 'int main()':
/in/foo.cc:9:16: warning: unused variable 't' [-Wunused-variable]
  int i,j,n,m,k,t,s,l,ma;
                ^
/in/foo.cc:9:18: warning: unused variable 's' [-Wunused-variable]
  int i,j,n,m,k,t,s,l,ma;
                  ^
/in/foo.cc:9:22: warning: unused variable 'ma' [-Wunused-variable]
  int i,j,n,m,k,t,s,l,ma;
                      ^~