Compilare: user.cpp: In function ‘int main()’: user.cpp:60:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!dq1.empty() && dq1.front().pos <= i - dq.size()) dq1.pop_front(); ^ user.cpp:64:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!dq2.empty() && dq2.front().pos <= i - dq.size()) dq2.pop_front(); ^ user.cpp:21:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(in, "r", stdin); ^ user.cpp:22:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(out, "w", stdout); ^ user.cpp:23:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ user.cpp:24:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:27:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^