Compilare: main.cpp: In constructor 'Solver::Solver(std::__cxx11::string&&, std::__cxx11::string&&)': main.cpp:20:9: warning: unused variable 'fout' [-Wunused-variable] FILE* fout = fopen(out.c_str(), "w"); ^~~~ main.cpp: In constructor 'Solver::Solver(std::__cxx11::string&&, std::__cxx11::string&&)': main.cpp:26:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &N, &Q); ^ main.cpp:31:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &ancestors[i]); ^ main.cpp:41:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &X, &P); ^ main.cpp:100:24: warning: 'ancestor' may be used uninitialized in this function [-Wmaybe-uninitialized] int power = __lg(P), ancestor; ^~~~~~~~