Compilare: main.cpp: In function 'int main()': main.cpp:106:43: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'int' [-Wformat=] printf("%ld %lld\n", levels[i], codes[i]); ^ main.cpp:38:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.in", "r", stdin); ^ main.cpp:39:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.out", "w", stdout); ^ main.cpp:41:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:44:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &nodes[i].value); ^