Compilare: main.cpp: In function 'int main()': main.cpp:213:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (el1 < v.size()){ ~~~~^~~~~~~~~~ main.cpp:221:48: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::pair<char, std::pair<int, int> > >::size_type {aka long unsigned int}' [-Wformat=] fprintf (fout,"%d\n" , v.size()); ^ main.cpp:224:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v.size() ; i++){ ~~^~~~~~~~~~ main.cpp:236:52: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::pair<char, std::pair<int, int> > >::size_type {aka long unsigned int}' [-Wformat=] fprintf (fout,"%d\n" , v.size()); ^ main.cpp:239:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v.size() ; i++){ ~~^~~~~~~~~~ main.cpp:171:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d\n",&p,&t); ^ main.cpp:173:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&n); ^