Compilare: main.cpp: In function 'int main()': main.cpp:27:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | while( i < v.size() ){ | ~~^~~~~~~~~~ main.cpp:29:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<elem>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while( j < v.size() && v[j].t == v[i].t ){ | ~~^~~~~~~~~~