View Compilation Error

0_0_33611994_15444.cpp: In function 'int main()':
0_0_33611994_15444.cpp:12:12: error: expected primary-expression before 'long'
 #define ll long long 
            ^
0_0_33611994_15444.cpp:14:13: note: in expansion of macro 'll'
 #define int ll
             ^
0_0_33611994_15444.cpp:75:18: note: in expansion of macro 'int'
         for (i = int(s1.size()) - 1; i >= 0; i--) {
                  ^
0_0_33611994_15444.cpp:12:12: error: expected primary-expression before 'long'
 #define ll long long 
            ^
0_0_33611994_15444.cpp:14:13: note: in expansion of macro 'll'
 #define int ll
             ^
0_0_33611994_15444.cpp:91:18: note: in expansion of macro 'int'
         for (i = int(s1.size()) - 1; i >= 0; i--) {
                  ^