Compilare: user.cpp: In function ‘void solve()’: user.cpp:41:12: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] mid = st + dr >> 1; ^ user.cpp: In function ‘void read(int&)’: user.cpp:13:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == dim) fread(buff, 1, dim, stdin), pos = 0; ^ user.cpp:16:55: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == dim) fread(buff, 1, dim, stdin), pos = 0; ^ user.cpp: In function ‘int main()’: user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("towers.in", "r", stdin); ^ user.cpp:51:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("towers.out", "w", stdout); ^