Compilare: main.cpp: In function 'bool Solve(std::__cxx11::string, int)': main.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cand.size() / 2; i++) { ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:100:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("logic3.in", "r", stdin); ^ main.cpp:101:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("logic3.out", "w", stdout); ^