Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:53:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&N); ^ user.cpp:57:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&v[i][j]); ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:40:13: warning: ‘node’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(Graph[node][i].first!=father) ^