Compilare: user.cpp: In function ‘void solve2()’: user.cpp:75:25: warning: unused variable ‘config2’ [-Wunused-variable] int configfinal, i, config2; ^ user.cpp: In function ‘void read()’: user.cpp:30:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:32:97: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lf%lf%lf%lf\n", &S [i].P [0].x, &S [i].P [0].y, &S [i].P [1].x, &S [i].P [1].y); ^ user.cpp: In function ‘int main()’: user.cpp:97:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("seg.in", "r", stdin); ^ user.cpp:98:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("seg.out", "w", stdout); ^ user.cpp:100:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^