Compilare: main.cpp: In function 'int main()': main.cpp:32:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<bottle>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i = 0; i < v.size(); ++i) | ~~^~~~~~~~~~ main.cpp:35:30: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<bottle>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int i = 0; i < v.size() && (s1 < l || s2 < l); ++i) | ~~^~~~~~~~~~ main.cpp:63:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<bottle>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for(int i = 0; i < v.size(); ++i) | ~~^~~~~~~~~~ main.cpp:65:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<bottle>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int i = 0; i < v.size() && (s1 < l || s2 < l); ++i) | ~~^~~~~~~~~~