Compilare: main.cpp: In function 'void solve(int)': main.cpp:29:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | #define rep(i, n) for(int i = 0; i < n; ++i) | ^ main.cpp:76:9: note: in expansion of macro 'rep' 76 | rep(i,sz(curr)){ | ^~~ main.cpp:29:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | #define rep(i, n) for(int i = 0; i < n; ++i) | ^ main.cpp:113:9: note: in expansion of macro 'rep' 113 | rep(i,sz(curr)){ | ^~~