Compilare: main.cpp: In function 'int posi(int, std::vector<int>&)': main.cpp:27:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (r < v.size()) ~~^~~~~~~~~~ main.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pos + r < v.size() && x > v[pos + r]) ~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:85:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bitonic.in", "r", stdin); ^ main.cpp:86:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bitonic.out", "w", stdout); ^