Compilare: main.cpp: In function 'int main()': main.cpp:80:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<date>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | for(int i=0;i<g2.size();i++) | ~^~~~~~~~~~ main.cpp:99:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<date>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | while(j+1<g1.size()&&nr==0) | ~~~^~~~~~~~~~ main.cpp:107:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<date>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | while(k+1<g1.size()&&g1[k+1].cost==g1[j].cost) | ~~~^~~~~~~~~~