Compilare: user.cpp: In function ‘int main()’: user.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < strlen(a); i++ ) ~~^~~~~~~~~~~ user.cpp:22:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] sum = sum + l[a[i]]; ^ user.cpp:29:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] while( w >= l[a[i]] && i < strlen(a) ) ^ user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( w >= l[a[i]] && i < strlen(a) ) ~~^~~~~~~~~~~ user.cpp:32:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] w = w - l[a[i]]; ^