Compilare: user.cpp: In function ‘int main()’: user.cpp:51:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ user.cpp:54:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &L); ^ user.cpp:55:24: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S + 1); ^ /tmp/ccBmX3nj.o: In function `main': user.cpp:(.text.startup+0x4c): warning: the `gets' function is dangerous and should not be used.