Compilare: main.cpp: In function 'int main()': main.cpp:33:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for(int i=0;i<a.size();i++) | ~^~~~~~~~~ main.cpp:34:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int j=i+1;j<a.size();j++) | ~^~~~~~~~~ main.cpp:35:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int k=j+1;k<a.size();k++) | ~^~~~~~~~~ main.cpp:46:38: warning: variable 'ok' set but not used [-Wunused-but-set-variable] 46 | bool ok=0; | ^~