Compilare: user.cpp: In function ‘void Add(char)’: user.cpp:19:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < t[nod].size(); ++i) ^ user.cpp: In function ‘int Query()’: user.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < strlen(s); ++i){ ^ user.cpp:48:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < t[nod].size()&&ok; ++j) ^ user.cpp:51:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == strlen(s)-1) return t[nod][j].nr; ^ user.cpp: In function ‘int main()’: user.cpp:59:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seti.in","r",stdin); ^ user.cpp:60:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("seti.out","w",stdout); ^ user.cpp:62:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&k); ^ user.cpp:64:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",a); ^ user.cpp:70:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&q); ^ user.cpp:72:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",s); ^