Compilare: user.cpp: In function ‘int main()’: user.cpp:24:46: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 2 has type ‘long double*’ [-Wformat=] for(i = 0; i < n; ++i) scanf("%lf", x + i); ^ user.cpp:28:24: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 2 has type ‘long double*’ [-Wformat=] scanf("%lf", &p); //p == p[i] ^ user.cpp:37:46: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 2 has type ‘long double*’ [-Wformat=] for(i = 0; i < n; ++i) scanf("%lf", y + i); ^ user.cpp:61:29: warning: format ‘%lf’ expects argument of type ‘double’, but argument 2 has type ‘long double’ [-Wformat=] printf("%.3lf ", val); ^ user.cpp:16:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecu.in", "r", stdin); ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ecu.out", "w", stdout); ^ user.cpp:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); N = 2 * n; ^ user.cpp:24:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; ++i) scanf("%lf", x + i); ^ user.cpp:28:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &p); //p == p[i] ^ user.cpp:37:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; ++i) scanf("%lf", y + i); ^