Compilare: main.cpp: In function 'int main()': main.cpp:43:8: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 43 | auto [x, y] = q.front(); | ^ main.cpp: In lambda function: main.cpp:71:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' 71 | auto [x, y] = q.front(); | ^ main.cpp: In function 'int main()': main.cpp:95:32: warning: second operand of conditional expression has no effect [-Wunused-value] 95 | fout << val ? val : -1 << '\n'; | ^ main.cpp:95:25: warning: third operand of conditional expression has no effect [-Wunused-value] 95 | fout << val ? val : -1 << '\n'; | ~~~^~~~~~~