Compilare: main.cpp: In function 'int main()': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:42:39: warning: format '%d' expects argument of type 'int', but argument 4 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d\n%d\n",cost,sol.size()-1); ^ main.cpp:43:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<sol.size();i++){ ~^~~~~~~~~~~ main.cpp:13:23: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ main.cpp:17:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&x,&y,&c); ^