Compilare: user.cpp: In function ‘int ROOT(int)’: user.cpp:37:16: warning: unused variable ‘aux’ [-Wunused-variable] int root = x, aux; ^ user.cpp: In function ‘int main()’: user.cpp:79:18: warning: unused variable ‘x’ [-Wunused-variable] for (int i = 1, x; i <= N; ++i) ^ user.cpp:74:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secvmax.in", "r", stdin); ^ user.cpp:75:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secvmax.out", "w", stdout); ^ user.cpp: In function ‘void read(int&)’: user.cpp:28:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++buf_pos >= DIM) fread(buf, 1, DIM, stdin), buf_pos = 0; ^ user.cpp:32:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++buf_pos == DIM) fread(buf, 1, DIM, stdin), buf_pos = 0; ^