Compilare: user.cpp: In member function ‘void trie::addDfs(iTrie*, int, int, int, int)’: user.cpp:41:13: warning: unused variable ‘il’ [-Wunused-variable] int il , ir , to; ^ user.cpp:41:18: warning: unused variable ‘ir’ [-Wunused-variable] int il , ir , to; ^ user.cpp: In member function ‘void trie::changeDfs(iTrie*, int, int)’: user.cpp:62:13: warning: unused variable ‘il’ [-Wunused-variable] int il , ir , to; ^ user.cpp:62:18: warning: unused variable ‘ir’ [-Wunused-variable] int il , ir , to; ^ user.cpp: In member function ‘void trie::mergeDfs(iTrie*, iTrie*, int, iTrie*, int, int, int)’: user.cpp:83:13: warning: unused variable ‘il’ [-Wunused-variable] int il , ir , to; ^ user.cpp:83:18: warning: unused variable ‘ir’ [-Wunused-variable] int il , ir , to; ^ user.cpp: In function ‘int main()’: user.cpp:246:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinder.in" , "r" , stdin); ^ user.cpp:247:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kinder.out" , "w" , stdout); ^ user.cpp:249:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &n); ^ user.cpp:250:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &m); ^ user.cpp:251:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &q); ^ user.cpp:258:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &t); ^ user.cpp:262:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &x); ^ user.cpp:263:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &value); ^ user.cpp:264:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &colour); ^ user.cpp:265:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]