Compilare: user.cpp: In function ‘int main()’: user.cpp:99:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n, m, k; scanf("%d%d%d", &n, &m, &k); ^ user.cpp:103:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int u, v, cost; scanf("%d%d%d", &u, &v, &cost); ^