Compilare: user.cpp: In function ‘std::vector<int> computeAns()’: user.cpp:73:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < stk.size(); ++ i) { ^ user.cpp: In function ‘int main()’: user.cpp:122:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++ i) ^ user.cpp:123:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << ans[i] - 1 << " \n"[i + 1 == ans.size()]; ^ user.cpp:85:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biathlon.in", "r", stdin); ^ user.cpp:86:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biathlon.out", "w", stdout); ^