Compilare: user.cpp: In function ‘void cit(int&, str&)’: user.cpp:121:41: 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:159:39: 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:160:41: 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:162:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &T); ^ user.cpp:166:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &N); ^ /tmp/ccYUPLID.o: In function `cit(int&, str&)': user.cpp:(.text+0x3d6): warning: the `gets' function is dangerous and should not be used.