Compilare: user.cpp: In function ‘int main()’: user.cpp:67:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (K <= X) sp(K-1, 0); ^ user.cpp:54:6: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:54:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:60:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.in", "r", stdin); ^ user.cpp:61:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.out", "w", stdout); ^ user.cpp:63:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld\n", &T); ^ user.cpp:65:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld\n", &N, &K); ^