Compilare: user.cpp: In function ‘int main()’: user.cpp:21:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echilibrare.in", "r", stdin); ^ user.cpp:22:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echilibrare.out", "w", stdout); ^ user.cpp:69:13: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized] int lin; ^