Compilare: user.cpp: In function ‘int main()’: user.cpp:64:11: warning: unused variable ‘a’ [-Wunused-variable] int t,a,b,c; ^ user.cpp:64:13: warning: unused variable ‘b’ [-Wunused-variable] int t,a,b,c; ^ user.cpp:64:15: warning: unused variable ‘c’ [-Wunused-variable] int t,a,b,c; ^ user.cpp:59:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.in", "r", stdin); ^ user.cpp:60:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbint.out", "w", stdout); ^