Compilare: main.cpp: In function 'int main()': main.cpp:65:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int i = 0; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:86:19: 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=] 86 | fprintf(fout, "%d\n", s.size()); | ~^ ~~~~~~~~ | | | | int std::vector<std::pair<int, int> >::size_type {aka long unsigned int} | %ld