Compilare: user.cpp: In function ‘int main()’: user.cpp:7:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i; ^ user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxe.in","r",stdin); ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxe.out","w",stdout); ^ user.cpp:8:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:29:12: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((mij-s)%2==1) ^