/in/foo.cc: In function 'void bd(int&, int, int, int)':
/in/foo.cc:54:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(l>r)return;int md=l+r>>1;
  ^~
/in/foo.cc:54:16: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(l>r)return;int md=l+r>>1;
                ^~~
/in/foo.cc:54:24: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  if(l>r)return;int md=l+r>>1;
                       ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:104:6: warning: unused variable 'T' [-Wunused-variable]
  int T,n,m,i,x,y,k;char s[19];
      ^