Compilare: user.cpp: In function ‘int main()’: user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,ia,ib; ^ user.cpp:24:13: warning: unused variable ‘ia’ [-Wunused-variable] int i,j,ia,ib; ^ user.cpp:24:16: warning: unused variable ‘ib’ [-Wunused-variable] int i,j,ia,ib; ^ user.cpp:25:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ user.cpp:26:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ user.cpp:27:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:29:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&v[i].a,&v[i].b,&v[i].c); ^