Compilare: main.cpp: In function 'int main()': main.cpp:33:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i = n; i < 2*n; i++) ^~~ main.cpp:36:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' while(s < f) ^~~~~ main.cpp:25:40: warning: unused variable 'p1' [-Wunused-variable] int i, s, f, sw = 0, fw = 0, ord, p1, p2, h; ^~ main.cpp:25:44: warning: unused variable 'p2' [-Wunused-variable] int i, s, f, sw = 0, fw = 0, ord, p1, p2, h; ^~ main.cpp:23:38: 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:24:40: 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:29:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:34:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &v[i]); ^