Compilare: user.cpp: In function ‘int main()’: user.cpp:82:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < candidates.size() && needed; ++j) ^ user.cpp:93:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < chosen.size(); ++j) ^ user.cpp:66:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ", &n); ^ user.cpp:70:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &a, &b); ^