Compilare: user.cpp: In function ‘int readInt(int&)’: user.cpp:36:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void solve(int)’: user.cpp:45:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = L[node]; i < G[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:64:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.in", "r", stdin); ^ user.cpp:65:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.out", "w", stdout); ^ user.cpp: In function ‘int readInt(int&)’: user.cpp:29:49: 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, HMAX, stdin), pos = 0; ^ user.cpp:34:49: 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, HMAX, stdin), pos = 0; ^