Compilare: user.cpp: In function ‘std::vector<std::vector<pir> > construct(int)’: user.cpp:35:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux.size(); i++) ^ user.cpp: In function ‘void citire()’: user.cpp:14:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:16:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp: In function ‘int main()’: user.cpp:105:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.in", "r", stdin); ^ user.cpp:106:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.out", "w", stdout); ^ user.cpp: In function ‘void solve()’: user.cpp:100:22: warning: ‘yb’ may be used uninitialized in this function [-Wmaybe-uninitialized] traseu(xb, yb, m); ^ user.cpp:100:22: warning: ‘xb’ may be used uninitialized in this function [-Wmaybe-uninitialized]