Compilare: main.cpp: In function 'void write()': main.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'ul' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 2; i <= n; ++i) { | ~~^~~~ main.cpp:43:21: warning: comparison of integer expressions of different signedness: 'int' and 'ul' {aka 'long unsigned int'} [-Wsign-compare] 43 | for (int i = 2; i <= n; ++i) { | ~~^~~~ main.cpp: In function 'void prim(int)': main.cpp:53:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 53 | auto [weight, node] = Q.top(); | ^ main.cpp:61:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 61 | for (auto [y, w] : G[node]) { | ^