Compilare: main.cpp: In function 'lint solve(lint, lint)': main.cpp:23:28: warning: unused variable 'on' [-Wunused-variable] lint i, j, u, ans = 0, on = n; ^~ main.cpp:24:10: warning: unused variable 'ft' [-Wunused-variable] bool ft = false; ^~ main.cpp: In function 'int main()': main.cpp:67:14: warning: array subscript is below array bounds [-Warray-bounds] nr[-1] = -1; ~~~~~^