View Compilation Error

0_0_16886032_17062.cpp: In function 'double fccp(Point*, int, int)':
0_0_16886032_17062.cpp:72:41: error: 'sort' was not declared in this scope
  sort (vp.begin (), vp.end (), PtCmpY ());
                                         ^
0_0_16886032_17062.cpp: In function 'int main()':
0_0_16886032_17062.cpp:98:32: error: 'sort' was not declared in this scope
   sort (pts, pts + N, PtCmpX ());
                                ^