Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecin[nod].size();i++) ^ user.cpp: In function ‘void dfs2(int, int, int)’: user.cpp:77:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecin[nod].size();i++) ^ user.cpp: In function ‘int lca(int, int)’: user.cpp:150:13: warning: statement has no effect [-Wunused-value] nivel[n1]; ^ user.cpp:151:13: warning: statement has no effect [-Wunused-value] nivel[n2]; ^ user.cpp: In function ‘void prec(int)’: user.cpp:174:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].fii.size();j++){ ^ user.cpp: In function ‘int main()’: user.cpp:215:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("plimbare3.in","r",stdin); ^ user.cpp:216:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("plimbare3.out","w",stdout); ^ user.cpp:219:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&n); ^ user.cpp:222:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^