Compilare: main.cpp: In function 'void cit(int&)': main.cpp:20:45: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ax, 1, dim, stdin), pz = 0; ^ main.cpp:24:45: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(ax, 1, dim, stdin), pz = 0; ^ main.cpp: In function 'int main()': main.cpp:31:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("easychoice.in", "r", stdin); ^ main.cpp:60:10: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized] g << res << endl; ^~~