Compilare: main.cpp: In function 'void df(int)': main.cpp:41:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[x].size();++i) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<g[i].size();++j) ~^~~~~~~~~~~~ main.cpp:68:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (i=1;i<=n;++i) ^~~ main.cpp:70:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for (i=2;i<=n;++i) ^~~