Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:29:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=v[nod].size(); ++i) ^ user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:98:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[fin].size(); ++i) ^ user.cpp:76:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("northrend.in", "r", stdin); ^ user.cpp:77:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("northrend.out", "w", stdout); ^ user.cpp:81:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &fin); ^ user.cpp:85:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &aux.c); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:38:5: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr>1) ^