View Compilation Error

0_0_33606465_5752.cpp: In function 'int main()':
0_0_33606465_5752.cpp:75:30: error: 'xx' was not declared in this scope
    if(s12&&s21&&other2) ans-=xx+s12*s21*other2;
                              ^
0_0_33606465_5752.cpp:76:30: error: 'xx' was not declared in this scope
    if(s12&&s22&&other2) ans-=xx+s12*s22*other2;
                              ^
0_0_33606465_5752.cpp:77:30: error: 'xx' was not declared in this scope
    if(s12&&s22&&other1) ans-=xx+s12*s22*other1;
                              ^