Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:47:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘void next()’: user.cpp:12:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(sir,1,dim,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:94:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cumainilecurate.in","r",stdin); ^ user.cpp:95:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cumainilecurate.out","w",stdout); ^