Compilare: main.cpp: In function 'int main()': main.cpp:35:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(i=1;i<sol.size();i++) | ~^~~~~~~~~~~ main.cpp:23:13: warning: unused variable 'x' [-Wunused-variable] 23 | int i,n,x,y,ct=0,start; | ^ main.cpp:23:15: warning: unused variable 'y' [-Wunused-variable] 23 | int i,n,x,y,ct=0,start; | ^