Compilare: user.cpp: In function ‘int* dfs(int)’: user.cpp:12:7: warning: address of local variable ‘ans’ returned [-Wreturn-local-addr] int ans[ad[n] + 1]; ^~~ user.cpp: In function ‘int main()’: user.cpp:100:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("craciun.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:45:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 262144, fin); ^