Compilare: user.cpp: In function ‘int main()’: user.cpp:24:9: warning: unused variable ‘x’ [-Wunused-variable] int x = i; ^ user.cpp:25:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans = 0; ^ user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dicsi.in", "r", stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dicsi.out", "w", stdout); ^