Compilare: user.cpp:6:39: warning: integer overflow in expression [-Woverflow] const int nmax=(1<<21)+13,inf=(1<<31)-1; ^ user.cpp: In function ‘void hash_adauga(int)’: user.cpp:14:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1[a].size();i++) ^ user.cpp: In function ‘void hash_scade(int)’: user.cpp:26:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1[a].size();i++) ^ user.cpp: In function ‘int hash_query(int)’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1[a].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:54:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.in", "r", stdin); ^ user.cpp:55:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.out", "w", stdout); ^ user.cpp:57:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&s); ^ user.cpp:60:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&c[i]); ^