Compilare: main.cpp: In constructor 'Solver::Solver(std::__cxx11::string&&, std::__cxx11::string&&)': main.cpp:25:31: 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:30:36: 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:39:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &X, &P); ^