Compilare: user.cpp: In function ‘void bfs()’: user.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<neighbors[nod].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:82:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<neighbors[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:23:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&N,&M,&S,&D); ^ user.cpp:27:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^ user.cpp:34:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&cost); ^