Compilare: main.cpp: In function 'int query(int, int)': main.cpp:45:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r > costumes.size ()) return 0; ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:61:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("brperm.in", "r", stdin); ^ main.cpp:62:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("brperm.out", "w", stdout); ^