Compilare: main.cpp: In function 'void bfs(int)': main.cpp:70:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[a].size();i++) { ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:87:60: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d%d" ,&n ,&m ,&pl ,&pc ,&cl ,&cc); ^ main.cpp:90:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d" ,&h[i][l]); ^