Compilare: user.cpp: In function ‘int main()’: user.cpp:55:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<B.size(); i++) ^ user.cpp:44:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbsat2.in", "r", stdin); ^ user.cpp:45:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arbsat2.out", "w", stdout); ^ user.cpp:47:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ user.cpp:49:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &A[i].first, &A[i].second); ^ user.cpp: In function ‘void solve(int, int)’: user.cpp:34:27: warning: ‘ultima’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (poz == ultima + 1); ^