Compilare: main.cpp: In function 'int main()': main.cpp:45:36: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout,"%d\n",mans.size()); ^ main.cpp:46:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<mans.size();++i) ~^~~~~~~~~~~~ main.cpp:23:30: 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:26:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&x,&y,&c); ^