Compilare: user.cpp: In function ‘void solve()’: user.cpp:25:14: warning: unused variable ‘x’ [-Wunused-variable] int nrm, x; ^ user.cpp: In function ‘void read()’: user.cpp:9:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transformari.in", "r", stdin); ^ user.cpp:10:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp: In function ‘void write()’: user.cpp:34:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transformari.out", "w", stdout); ^