Compilare: main.cpp: In function 'int main()': main.cpp:63:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.in","r",stdin); ^ main.cpp:65:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ssm.out","w",stdout); ^ main.cpp: In function 'void cit(int&)': main.cpp:23:45: 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; ^ main.cpp:35:44: 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; ^ main.cpp:47:45: 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; ^