Compilare: user.cpp: In member function ‘myTrie* myTrie::addPal(long int, long int)’: user.cpp:31:19: warning: statement has no effect [-Wunused-value] for(bg;bg<=en;bg++){ ^ user.cpp: In function ‘int main()’: user.cpp:74:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.in","r",stdin); ^ user.cpp:75:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.out","w",stdout); ^ user.cpp:77:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s); sa[0] = '@'; ^