Compilare: main.cpp: In function 'int main()': main.cpp:61:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("jap2.in", "r", stdin); ^ main.cpp:62:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("jap2.out", "w", stdout); ^ main.cpp:66:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld%lld", &P, &q); ^ main.cpp:69:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld%lld", &a, &b); ^