Compilare: user.cpp: In function ‘int main()’: user.cpp:97:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < answers.size(); ++i) ^ user.cpp:84:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("lapte.in", "r", stdin); ^ 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 ("lapte.out", "w", stdout); ^ user.cpp:87:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &L); ^ user.cpp:88:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (int i = 1; i <= N; ++i) scanf ("%d %d", &A[i], &B[i]); ^