Compilare: user.cpp: In function ‘void solve()’: user.cpp:75:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:111:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.out","w",stdout); ^ user.cpp: In function ‘int main()’: user.cpp:121:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gminmax.in","r",stdin); ^ user.cpp: In function ‘void cit(int&)’: user.cpp:16:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pz==dim)fread(ax,1,dim,stdin),pz=0; ^ user.cpp:20:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pz==dim)fread(ax,1,dim,stdin),pz=0; ^