Compilare: user.cpp: In function ‘int main()’: user.cpp:17:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((dq.size()>a && dq.front()<0)||dq.size()>b) ^ user.cpp:17:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while((dq.size()>a && dq.front()<0)||dq.size()>b) ^ user.cpp:6:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum2.in", "r", stdin); ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum2.out", "w", stdout); ^ user.cpp:11:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &a, &b); ^ user.cpp:14:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tmp); ^