Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘int LCA(int, int)’: user.cpp:62:15: warning: unused variable ‘dif’ [-Wunused-variable] int st,dr,dif; ^ user.cpp: In function ‘int main()’: user.cpp:136:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<M[i].size();++j) ^ user.cpp:141:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<M[i].size();++j) ^ user.cpp:143:17: warning: unused variable ‘nod1’ [-Wunused-variable] int nod1=M[i][j-1]; ^ user.cpp:144:17: warning: unused variable ‘nod2’ [-Wunused-variable] int nod2=M[i][j]; ^ user.cpp:151:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<noduri.size();++j) ^ user.cpp:103:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdist.in","r",stdin); ^ user.cpp:104:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("kdist.out","w",stdout); ^ user.cpp:105:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:108:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:113:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cul[i]); ^