View Compilation Error

0_0_37908052_30255.cpp: In function 'int main()':
0_0_37908052_30255.cpp:48:9: error: 'n' was not declared in this scope
         n = s.size(), m = t.size();
         ^
0_0_37908052_30255.cpp:48:23: error: 'm' was not declared in this scope
         n = s.size(), m = t.size();
                       ^