Compilare: user.cpp: In function ‘void bfs1()’: user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[old_node].size();k++) ~^~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void bfs2()’: user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<v[old_node].size();k++) ~^~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:83:1: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=1;i<=k;i++) ^~~ user.cpp:85:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ return 0; ^~~~~~