/in/foo.cc:6:37: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
 const int INF=(int)((long long)1<<31-1);
                                   ~~^~
/in/foo.cc: In function 'void solve(int, int, int, int)':
/in/foo.cc:30:27: warning: 'where' may be used uninitialized in this function [-Wmaybe-uninitialized]
     solve(l,mid-1,L,where);
                           ^