Compilare: user.cpp: In function ‘int main()’: user.cpp:108:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dragonball.in", "r", stdin); ^ user.cpp:109:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dragonball.out", "w", stdout); ^ user.cpp:114:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &t); ^ user.cpp:116:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(BUFF); ^ user.cpp:120:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(BUFF); ^ /tmp/ccPUSeBE.o: In function `main': user.cpp:(.text.startup+0xe5): warning: the `gets' function is dangerous and should not be used.