Compilare: user.cpp: In function ‘void dfs1(int)’: user.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[i].size();j++) ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:47:4: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(int i = 1 ; i <= n ; ++i) ^~~ user.cpp:63:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ if(ok==1) ^~ user.cpp:68:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v2[i].size();j++) ~^~~~~~~~~~~~~