Compilare: user.cpp: In function ‘void solve()’: user.cpp:52:9: warning: unused variable ‘cost’ [-Wunused-variable] int cost = minim; ^ user.cpp: In function ‘void read()’: user.cpp:18:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:21:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^