Compilare: user.cpp: In function ‘int main()’: user.cpp:38:21: warning: unused variable ‘t’ [-Wunused-variable] int n, i, j, s, t, dt, k, l, ma; ^ user.cpp:38:34: warning: unused variable ‘ma’ [-Wunused-variable] int n, i, j, s, t, dt, k, l, ma; ^ user.cpp:34:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shop.in","r",stdin); ^ user.cpp:35:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("shop.out","w",stdout); ^ user.cpp:40:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&k,&s); ^ user.cpp:42:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i],&b[i]); ^