Compilare: main.cpp: In function 'void bfs()': main.cpp:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=0;t<m[z].size();t++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:38:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&d); ^ main.cpp:43:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^