Compilare: user.cpp: In function ‘bool check()’: user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos + Q.size() > n) ^ user.cpp: In function ‘void read_data()’: user.cpp:19:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:21:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &V[i]); ^ user.cpp: In function ‘int main()’: user.cpp:75:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%d", &t); t; --t) { ^