Compilare: user.cpp: In function ‘int main()’: user.cpp:29:9: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] int n,m,x,i,j,l0,c0,lf,cf; ^ user.cpp:27:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.in","r",stdin); ^ user.cpp:28:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxa.out","w",stdout); ^