Compilare: main.cpp: In function 'int32_t main()': main.cpp:2:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 2 | #define forin(i,a,b) for(int i=a;i<=b;++i) ...... 42 | forin(j,0,s.size() - 1) { | ~~~~~~~~~~~~~~~~ main.cpp:42:9: note: in expansion of macro 'forin' 42 | forin(j,0,s.size() - 1) { | ^~~~~ main.cpp:36:21: warning: unused variable 'tt' [-Wunused-variable] 36 | ll tmp = i, tt = x / 2; | ^~