Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:2:29: error: ‘stdin’ was not declared in this scope freopen("quadratum.in","r",stdin); ^ user.cpp:2:34: error: ‘freopen’ was not declared in this scope freopen("quadratum.in","r",stdin); ^ user.cpp:3:30: error: ‘stdout’ was not declared in this scope freopen("quadratum.out","w",stdout); ^ user.cpp:7:19: error: ‘scanf’ was not declared in this scope scanf("%d",&cases); ^ user.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=1; k <= cases; k++){ ^ user.cpp:25:22: error: ‘printf’ was not declared in this scope printf("%lld\n",sum); ^ user.cpp:10:27: warning: unused variable ‘i’ [-Wunused-variable] unsigned long long int k,i; ^