Compilare: main.cpp: In function 'void dfs2(int, std::__cxx11::string&)': main.cpp:17:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + 1 < son[x].size(); ++i) { ~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'std::__cxx11::string maxSuff(std::__cxx11::string)': main.cpp:64:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < rotC.size(); i += 2) { ~~^~~~~~~~~~~~~ main.cpp:65:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + 1 >= rotC.size()) ~~~~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:91:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("parb.in", "r", stdin); ^ main.cpp:92:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("parb.out", "w", stdout); ^