Compilare: user.cpp: In function ‘int main()’: user.cpp:154:10: warning: variable ‘da’ set but not used [-Wunused-but-set-variable] bool da = 0; ^ user.cpp: In function ‘void cit(int&, str&)’: user.cpp:104:41: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (sir + 1), L = strlen (sir + 1); ^ user.cpp: In function ‘int main()’: user.cpp:142:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("largestroot.in", "r", stdin); ^ user.cpp:143:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("largestroot.out", "w", stdout); ^ user.cpp:145:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &T); ^ user.cpp:149:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &N); ^ /tmp/cclNjg8R.o: In function `cit(int&, str&)': user.cpp:(.text+0x346): warning: the `gets' function is dangerous and should not be used.