Compilare: main.cpp: In function 'int main()': main.cpp:22:13: warning: unused variable 'unde' [-Wunused-variable] int unde; ^~~~ main.cpp:18:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &nr, &m); ^ main.cpp:23:60: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d %d", &n->nod, &n->unde, &n->cost); ^