Compilare: main.cpp: In function 'int main()': main.cpp:38:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for(i=0;i<a[poz].size();i++){ | ~^~~~~~~~~~~~~~ main.cpp:13:24: warning: unused variable 'd' [-Wunused-variable] 13 | int n, m, x, y, z, d, poz, i, dist_cur; | ^ main.cpp:13:27: warning: unused variable 'poz' [-Wunused-variable] 13 | int n, m, x, y, z, d, poz, i, dist_cur; | ^~~ main.cpp:13:35: warning: unused variable 'dist_cur' [-Wunused-variable] 13 | int n, m, x, y, z, d, poz, i, dist_cur; | ^~~~~~~~