Compilare: main.cpp: In function 'int main()': main.cpp:17:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("buline.in", "r", stdin); ^ main.cpp:18:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("buline.out", "w", stdout); ^ main.cpp:57:49: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << best << ' ' << start << ' ' << len << '\n'; ^~~~ main.cpp:57:35: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized] cout << best << ' ' << start << ' ' << len << '\n'; ^~~