Compilare: main.cpp: In function 'bool solve(std::__cxx11::string)': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return w.size() >= p && w.size() <= q; ~~~~~~~~~^~~~ main.cpp:25:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return w.size() >= p && w.size() <= q; ~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:39:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < n; i++) ~~^~~ main.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = i; j < n; j++) ~~^~~