Compilare: user.cpp: In function ‘void preprocesare()’: user.cpp:72:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i <= 2 * E.size() + 10; ++i) ^ user.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<E.size(); ++i) ^ user.cpp:79:33: 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:97:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[node].size(); ++i) ^ user.cpp: In function ‘void read()’: user.cpp:106:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.in", "rt", stdin); ^ user.cpp:107:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.out", "wt", stdout); ^ user.cpp:108:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &P); ^ user.cpp:119:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &v); ^ user.cpp:123:50: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d", &x, &y, &A, &B, &C, &D); ^