Compilare: main.cpp: In function 'int main()': main.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(int x=0;x<a.size();x++) | ~^~~~~~~~~ main.cpp:23:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int y=x+1;y<a.size();y++) | ~^~~~~~~~~ main.cpp:24:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int z=y+1;z<a.size();z++) | ~^~~~~~~~~