Compilare: user.cpp: In function ‘int main()’: user.cpp:80:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("heavypath.in", "r", stdin); ^ user.cpp:81:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("heavypath.out", "w", stdout); ^ user.cpp: In function ‘void get(int&)’: user.cpp:153:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer, 1, NMAX, stdin), bufpoz = 0; ^ user.cpp:158:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer, 1, NMAX, stdin), bufpoz = 0; ^ user.cpp:165:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer, 1, NMAX, stdin), bufpoz = 0; ^