Compilare: user.cpp: In function ‘int main()’: user.cpp:9:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.in", "r", stdin); ^ user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv2.out", "w", stdout); ^ user.cpp:41:27: warning: ‘fin’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << inc << " " << fin << " " << ans; ^ user.cpp:41:13: warning: ‘inc’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << inc << " " << fin << " " << ans; ^