Compilare: user.cpp: In function ‘void add(int)’: user.cpp:18:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp: In function ‘long long int cauta(int)’: user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[r].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:50:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.in","r",stdin); ^ user.cpp:51:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eqs.out","w",stdout); ^ user.cpp:52:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 1; i <= 5; ++i) scanf("%d",&a[i]); ^ user.cpp:67:67: warning: array subscript is above array bounds [-Warray-bounds] sum = a[3] * (i * i *i) + a[4] * (j * j *j) + a[5] * (k *k *k); ^