Compilare: user.cpp: In function ‘void solve()’: user.cpp:58:15: warning: unused variable ‘m’ [-Wunused-variable] -- i; int m = i; ^ user.cpp: In function ‘void read()’: user.cpp:10:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastila.in", "r", stdin); ^ user.cpp:11:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1); ^ user.cpp: In function ‘void write()’: user.cpp:92:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastila.out", "w", stdout); ^ /tmp/ccI8XYt4.o: In function `read()': user.cpp:(.text+0x30): warning: the `gets' function is dangerous and should not be used.