Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[node].size();i++) ^ user.cpp: In function ‘bool BFS2(int, int)’: user.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph2[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:85:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Graph[X].size();j++) ^ user.cpp:93:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Graph[X].size();i++) ^ user.cpp:72:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d%d%d",&N,&M,&U,&X); ^ user.cpp:74:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d",&v[i]); ^ user.cpp:78:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d%d",&X,&Y); ^