Compilare: main.cpp: In function 'int main()': main.cpp:31:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(i=0; i<vx.size(); i++) px[vx[i]]=i; | ~^~~~~~~~~~ main.cpp:32:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(i=0; i<vy.size(); i++) py[vy[i]]=i; | ~^~~~~~~~~~ main.cpp:20:10: warning: unused variable 'j' [-Wunused-variable] 20 | int i, j, a, b, rad; | ^ main.cpp:20:19: warning: unused variable 'rad' [-Wunused-variable] 20 | int i, j, a, b, rad; | ^~~