Compilare: main.cpp: In function 'int main()': main.cpp:37:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int it = 0; it < dq.size(); ++it) printf("%d ", dq[it].first); ~~~^~~~~~~~~~~ main.cpp:45:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int it = 0; it < dq.size(); ++it) printf("%d ", dq[it].first); ~~~^~~~~~~~~~~ main.cpp:23:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deque.in", "r", stdin); ^ main.cpp:24:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("deque.out", "w", stdout); ^ main.cpp:26:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &k); ^ main.cpp:28:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n[it]); ^