Compilare: user.cpp: In function ‘int main()’: user.cpp:59:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<SOL.size(); i++) ~^~~~~~~~~~~ user.cpp:28:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.in", "r", stdin); ^ user.cpp:29:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.out", "w", stdout); ^ user.cpp:30:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lf", &N, &L); ^ user.cpp:33:82: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf %lf", &T[i].a, &T[i].b, &T[i].k, &T[i].q, &T[i].v); ^