Compilare: main.cpp: In function 'int main()': main.cpp:78:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for (int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp:79:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 79 | for (int j = i + 1; j < a.size(); j++) { | ~~^~~~~~~~~~ main.cpp:80:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | for (int k = j + 1; k < a.size(); k++) { | ~~^~~~~~~~~~