Compilare: user.cpp: In function ‘void Add(int)’: user.cpp:18:9: warning: unused variable ‘i’ [-Wunused-variable] int 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:51:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == strlen(s)-1)return nr[t[nod][j]]; ^ user.cpp:42:10: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable] bool ok; ^ user.cpp: In function ‘int main()’: user.cpp:58:33: 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:59:35: 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:61:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&k); ^ user.cpp:63:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",a); ^ user.cpp:71:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&q); ^ user.cpp:73:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n",s); ^