/in/foo.cc: In function 'int main()':
/in/foo.cc:38:52: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
             printf("%d\n",lsum=lsum-to[x]+(to[x]=y));
                                                    ^
/in/foo.cc:38:49: warning: operation on 'to[x]' may be undefined [-Wsequence-point]
             printf("%d\n",lsum=lsum-to[x]+(to[x]=y));
                                           ~~~~~~^~~