/in/foo.cc: In function 'void marge(int, int)':
/in/foo.cc:22:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:45:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for (rr=ll+2;rr<=n;++rr) if(h[rr]>h[rr-1]) break; --rr;
   ^~~
/in/foo.cc:45:53: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   for (rr=ll+2;rr<=n;++rr) if(h[rr]>h[rr-1]) break; --rr;
                                                     ^~
/in/foo.cc:46:25: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   for (register int i=rr-ll>>1;i>=0;--i) swap(h[rr-i],h[ll+i]);
                       ~~^~~