Compilare: main.cpp: In function 'int main()': main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[x].size();j++) ~^~~~~~~~~~~~ main.cpp:95:32: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::queue<nod>::size_type {aka long unsigned int}' [-Wformat=] fprintf(out,"%d\n",q.size()); ^ main.cpp:33:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&m); ^ main.cpp:36:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&x,&y,&val); ^