Compilare: main.cpp: In function 'int main()': main.cpp:53:49: 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(fout,"%d\n%d\n",cost,solution.size()); ^ main.cpp:40:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:42:59: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&G[i].n1, &G[i].n2, &G[i].c); ^