Compilare: user.cpp: In function ‘int main()’: user.cpp:5:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:5:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:6:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscarb.in", "r", stdin); ^ user.cpp:7:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pscarb.out", "w", stdout); ^