Compilare: user.cpp: In function ‘int main()’: user.cpp:17:22: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[17]’ [-Wformat=] scanf("%s",&s); ^ user.cpp:25:47: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(Q[s[0]-'a'].size())x=Q[s[0]].top(); ^ user.cpp:12:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("raci.in","r",stdin); ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("raci.out","w",stdout); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&s); ^