Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) if(v[nod][i]!=ant) dfs(v[nod][i],nod); ^ user.cpp: In function ‘int sterge(int, int)’: user.cpp:29:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod1].size();++i) if(v[nod1][i]!=ant1) {++t1;qa.push({v[nod1][i],nod1});} ^ user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod2].size();++i) if(v[nod2][i]!=ant2) {++t2;qb.push({v[nod2][i],nod2});} ^ user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod1].size();++i) if(v[nod1][i]!=ant1) {++t1;qa.push({v[nod1][i],nod1});} ^ user.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod2].size();++i) if(v[nod2][i]!=ant2) {++t2;qb.push({v[nod2][i],nod2});} ^ user.cpp:53:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[a].size();++j) if(v[a][j]==b) {v[a].erase(v[a].begin()+j);break;} ^ user.cpp:73:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[b].size();++j) if(v[b][j]==a) {v[b].erase(v[b].begin()+j);break;} ^