/in/foo.cc: In function 'void cdq(int, int)':
/in/foo.cc:28:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(l==r) return;memset(c,0,sizeof(c));
  ^~
/in/foo.cc:28:18: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(l==r) return;memset(c,0,sizeof(c));
                  ^~~~~~
/in/foo.cc:29:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1,owo=0;cdq(l,mid);cdq(mid+1,r);
          ~^~