Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:11:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < g[nod].size() ; ++ i ) ^ user.cpp:14:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < g[nod].size() ; ++ i ) ^ user.cpp: In function ‘int main()’: user.cpp:21:12: warning: unused variable ‘m’ [-Wunused-variable] int n, m, i, a, b, my_max; ^ user.cpp:19:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "asmax.in", "r", stdin ); ^ user.cpp:20:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "asmax.out", "w", stdout ); ^ user.cpp:22:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &n ); ^ user.cpp:24:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d", &v[i] ); ^ user.cpp:28:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d", &a, &b ); ^