Compilare: user.cpp: In function ‘int main()’: user.cpp:54:15: warning: unused variable ‘i’ [-Wunused-variable] int n,m,k,i,j,q; ^ user.cpp:54:17: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,i,j,q; ^ user.cpp:52:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.in","r",stdin); ^ user.cpp:53:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.out","w",stdout); ^ user.cpp:56:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:59:94: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&inter[q].x1,&inter[q].y1,&inter[q].x2,&inter[q].y2,&inter[q].val); ^