Compilare: user.cpp: In function ‘void Insert_Trie(Trie*, char*)’: user.cpp:27:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<nod->let.size();x++) ^ user.cpp: In function ‘bool Find(Trie*, char*)’: user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<nod->son.size();x++) ^ user.cpp:61:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<nod->let.size();x++) ^ user.cpp: In function ‘void Add(Trie*, char*, int)’: user.cpp:77:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<nod->let.size();x++) ^ user.cpp: In function ‘void Erase_Trie(Trie*)’: user.cpp:88:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int x=0;x<nod->let.size();x++) ^ user.cpp: In function ‘int main()’: user.cpp:101:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&t); ^ user.cpp:104:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:146:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&r); ^