Compilare: main.cpp: In function 'int main()': main.cpp:61:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.in", "r", stdin); ^ main.cpp:62:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("recurenta2.out", "w", stdout); ^ main.cpp:65:52: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d", &a, &b, &c, &x1, &x2, &n); ^