Compilare: main.cpp: In function 'void write()': main.cpp:86:46: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d ",sol[v2[i].ind].size()); ^ main.cpp:87:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<sol[v2[i].ind].size(); j++) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:25:28: 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:28:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^