foo.cpp: In function 'int main()':
foo.cpp:116:22: error: request for member 'r' in 'co', which is of non-class type 'huasheng [410]'
 int o=abs(co[i].r-co.r)+abs(co[i].c-co.c);
                      ^
foo.cpp:116:40: error: request for member 'c' in 'co', which is of non-class type 'huasheng [410]'
 int o=abs(co[i].r-co.r)+abs(co[i].c-co.c);
                                        ^