Compilare: main.cpp: In function 'void start()': main.cpp:99:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for(int j = 0; j<pct.size(); j++) | ~^~~~~~~~~~~