Compilare: user.cpp: In function ‘int main()’: user.cpp:57:10: warning: unused variable ‘y’ [-Wunused-variable] int x, y; ^ user.cpp:52:9: warning: unused variable ‘m’ [-Wunused-variable] int n, m, e; ^ user.cpp:52:12: warning: unused variable ‘e’ [-Wunused-variable] int n, m, e; ^ user.cpp:46:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caroiaj.in", "rt", stdin); ^ user.cpp:47:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("caroiaj.out", "w", stdout); ^