Compilare: user.cpp: In function ‘int main()’: user.cpp:27:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "infasuratoare.in", "r", stdin ); ^ user.cpp:28:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "infasuratoare.out", "w", stdout ); ^ user.cpp:30:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n ); ^ user.cpp:33:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%lf%lf", &p[i].x, &p[i].y ); ^ user.cpp:37:19: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(p[1],p[j]); ^