Compilare: user.cpp: In function ‘void Dfs(int)’: user.cpp:152:13: warning: unused variable ‘lca’ [-Wunused-variable] int a,b,lca,sol,cost; ^ user.cpp: In function ‘int main()’: user.cpp:181:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("paznici3.in","r",stdin); ^ user.cpp:182:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("paznici3.out","w",stdout); ^ user.cpp:183:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N,&M); ^ user.cpp:186:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a,&b); ^ user.cpp: In function ‘void Parcurgere()’: user.cpp:73:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &w.cost,&w.a,&w.b); ^