Compilare: user.cpp: In function ‘void preprocesare()’: user.cpp:52:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1, carry = 0; i<=2*E.size(); ++i, ++carry) { ^ user.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<E.size(); ++i) ^ user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<E.size(); ++i) ^ user.cpp: In function ‘void Euler(int, int)’: user.cpp:75:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[node].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:26:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp: In function ‘void read()’: user.cpp:82:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in", "rt", stdin); ^ user.cpp:83:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out", "wt", stdout); ^ user.cpp:84:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:91:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b); ^