Compilare: user.cpp: In function ‘int main()’: user.cpp:36:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(qst.size() > a) ^ user.cpp:38:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(qdr.size() > a) ^ user.cpp:66:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(qst.size() > b) ^ user.cpp:68:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(qdr.size() > b) ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drept2.in", "r", stdin); ^ user.cpp:18:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &m, &n, &a, &b); ^ user.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &L); ^