Compilare: user.cpp: In function ‘void solve()’: user.cpp:167:17: warning: unused variable ‘node’ [-Wunused-variable] int node = get_code(x, y); ^ user.cpp: In function ‘void input()’: user.cpp:49:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &k); ^ user.cpp: In function ‘void solve()’: user.cpp:163:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int nr; scanf("%d", &nr); ^ user.cpp:166:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:178:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciocolata2.in","r",stdin); ^ user.cpp:179:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ciocolata2.out","w",stdout); ^