View Compilation Error

0_0_32746494_29787.cpp: In function 'int main()':
0_0_32746494_29787.cpp:7:24: error: 'min' was not declared in this scope
         minx1=min(x1,x2),miny1=min(y1,y2),maxx1=max(x1,x2),maxy1=max(y1,y2);
                        ^
0_0_32746494_29787.cpp:7:58: error: 'max' was not declared in this scope
         minx1=min(x1,x2),miny1=min(y1,y2),maxx1=max(x1,x2),maxy1=max(y1,y2);
                                                          ^