Compilare: main.cpp: In function 'int main()': main.cpp:30:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<x.size()) ~^~~~~~~~~ main.cpp:32:19: warning: array subscript has type 'char' [-Wchar-subscripts] if (l[x[i]] <= n-3) ^ main.cpp:35:25: warning: array subscript has type 'char' [-Wchar-subscripts] n=n - l[x[i]]; ^