Compilare: main.cpp: In function 'void solve()': main.cpp:20:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < s.size(); i++) { ~~^~~~~~~~~~ main.cpp:21:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (lung > 0 && lung - 1 + (s.size() - i) >= m && st[lung] < s[i]) ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp: In function 'void output()': main.cpp:29:6: warning: unused variable 'i' [-Wunused-variable] int i; ^