Compilare: user.cpp: In function ‘int invm(long long int)’: user.cpp:9:9: warning: unused variable ‘i’ [-Wunused-variable] int i, p = mod - 2, ans = 1, aux = x; ^ user.cpp: In function ‘void read()’: user.cpp:33:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sandokan.in", "r", stdin); ^ user.cpp:34:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp: In function ‘void write()’: user.cpp:47:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sandokan.out", "w", stdout); ^