Compilare: user.cpp: In function ‘void Insert()’: user.cpp:31:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[node].size() && !is;++i) ^ user.cpp: In function ‘void Delete()’: user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[node].size() && !is;++i) ^ user.cpp: In function ‘void Prefix()’: user.cpp:90:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[node].size() && !is;++i) ^ user.cpp: In function ‘void Query()’: user.cpp:118:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[node].size() && !is;++i) ^ user.cpp: In function ‘int main()’: user.cpp:145:22: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[150001]’ [-Wformat=] scanf("%d%s",&type,&S); ^ user.cpp:163:26: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[150001]’ [-Wformat=] scanf("%d%s",&type,&S); ^ user.cpp:142:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.in","r",stdin); ^ user.cpp:143:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out","w",stdout); ^ user.cpp:145:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%s",&type,&S); ^ user.cpp:163:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%s",&type,&S); ^