View Compilation Error

0_0_14824093_6025.cpp: In function 'void mix(int, int)':
0_0_14824093_6025.cpp:35:9: error: 'ans' was not declared in this scope
         ans += (sa[rx]+num[ry])*(sa[rx]+sa[ry]-1)-sa[rx]*(sa[rx]-1) - sa[ry]*(sa[ry]-1);
         ^
0_0_14824093_6025.cpp:35:24: error: 'num' was not declared in this scope
         ans += (sa[rx]+num[ry])*(sa[rx]+sa[ry]-1)-sa[rx]*(sa[rx]-1) - sa[ry]*(sa[ry]-1);
                        ^