Compilare: user.cpp: In function ‘void Solve()’: user.cpp:118:10: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (i > 0 & j + 1 < N) { ^ user.cpp: In function ‘int main()’: user.cpp:151:6: warning: unused variable ‘i’ [-Wunused-variable] int i, T; ^ user.cpp:142:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:143:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^