Compilare: user.cpp: In function ‘void Solve()’: user.cpp:57:23: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] int pos_use = pos_a + pos_b >> 1; ^ user.cpp: In function ‘int main()’: user.cpp:95:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("magnet.in", "r", stdin); ^ user.cpp:96:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("magnet.out", "w", stdout); ^