Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:21:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[x].size();++i) {if(seen[node]==0) dfs(node,val+1);} ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void bwdfs(int, int)': main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[x].size();++i){if(seen[node]==seen[x]-1) {bwdfs(node,val); return;}} ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void Dfs(int)': main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[x].size();++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:91:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i=1;i<=n;++i) seen[i]=0; seen[root]=1; last=root; ^~~ main.cpp:91:38: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(int i=1;i<=n;++i) seen[i]=0; seen[root]=1; last=root; ^~~~ main.cpp:95:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vecini[last].size();++i) ~^~~~~~~~~~~~~~~~~~~~