/in/foo.cc: In function 'int main()':
/in/foo.cc:5:21: warning: unused variable 't' [-Wunused-variable]
  int n, k, c[20], i,t=0,s=0;
                     ^
/in/foo.cc:5:25: warning: unused variable 's' [-Wunused-variable]
  int n, k, c[20], i,t=0,s=0;
                         ^