Compilare: user.cpp: In member function ‘void aint::solve(int)’: user.cpp:74:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos + 1 < data[node].size()) { ^ user.cpp: In function ‘int main()’: user.cpp:145:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.in","r",stdin); ^ user.cpp:146:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tri3.out","w",stdout); ^ user.cpp:148:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:150:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &P[i].x, &P[i].y); ^ user.cpp:153:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &Q[i].A.x, &Q[i].A.y); ^ user.cpp:154:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &Q[i].B.x, &Q[i].B.y); ^