Compilare: main.cpp: In function 'std::vector<int> lca(const std::vector<int>*, int, int, FILE*, FILE*)': main.cpp:88:9: warning: unused variable 'num_nodes' [-Wunused-variable] int num_nodes = n; ^~~~~~~~~ main.cpp:101:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^ main.cpp: In function 'int main()': main.cpp:113:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ main.cpp:118:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^