View Compilation Error

0_0_33563464_18258.cpp: In function 'int main()':
0_0_33563464_18258.cpp:29:16: error: expected primary-expression before ',' token
         sort(ro,ro+n,cmp);
                ^
0_0_33563464_18258.cpp:29:19: error: expected primary-expression before '+' token
         sort(ro,ro+n,cmp);
                   ^