Compilare: main.cpp: In function 'int main()': main.cpp:33:40: warning: unused variable 'p1' [-Wunused-variable] int i, s, f, sw = 0, fw = 0, ord, p1, p2; ^~ main.cpp:33:44: warning: unused variable 'p2' [-Wunused-variable] int i, s, f, sw = 0, fw = 0, ord, p1, p2; ^~ main.cpp:31:38: 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:32:40: 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:34:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:39:80: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] {v[i].poz = i + 1 - n;v[i].r = v[i].l = NULL;scanf("%lld", &(v[i].val));} ^