Compilare: main.cpp: In function 'int main()': main.cpp:94:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for(int j=0; j<knapsack.size(); j++) | ~^~~~~~~~~~~~~~~~ main.cpp:103:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for(i=1; i<knapsack.size(); i++) | ~^~~~~~~~~~~~~~~~