Compilare: user.cpp: In function ‘int main()’: user.cpp:35:6: warning: unused variable ‘i’ [-Wunused-variable] int i, x, y; ^ user.cpp:35:9: warning: unused variable ‘x’ [-Wunused-variable] int i, x, y; ^ user.cpp:35:12: warning: unused variable ‘y’ [-Wunused-variable] int i, x, y; ^ user.cpp:37:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.in", "r", stdin); ^ user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("combinari.out", "w", stdout); ^ user.cpp:40:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^