Compilare: user.cpp: In function ‘void Read()’: user.cpp:30:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &C); ^ user.cpp:33:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^ user.cpp:38:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &Node[i].c); ^ user.cpp: In function ‘long long int SumDist(int)’: user.cpp:109:16: warning: ‘v’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol += 1LL * Node[v].lvl * sz; ^