Compilare: user.cpp: In function ‘int main()’: user.cpp:18:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>s+1; ^ user.cpp:24:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!q.empty() && q.back() < s[i] && q.size() + n-i >= k) q.pop_back(); ^