Compilare: main.cpp: In function 'int main()': main.cpp:147:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 147 | for (i = 0; i< sol.size(); i++) | ~^~~~~~~~~~~~ main.cpp:101:15: warning: unused variable 'x' [-Wunused-variable] 101 | int i, j, x, y, p, k, nr; | ^ main.cpp:101:18: warning: unused variable 'y' [-Wunused-variable] 101 | int i, j, x, y, p, k, nr; | ^ main.cpp:101:24: warning: unused variable 'k' [-Wunused-variable] 101 | int i, j, x, y, p, k, nr; | ^ main.cpp:101:27: warning: unused variable 'nr' [-Wunused-variable] 101 | int i, j, x, y, p, k, nr; | ^~