Compilare: user.cpp: In function ‘bool check(int, int, int)’: user.cpp:20:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[b[i]] < cnt[p][b[i]] + coef) { ^ user.cpp:20:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[b[i]] < cnt[p][b[i]] + coef) { ^ user.cpp:23:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] p = pos[b[i]][cnt[p][b[i]] + coef]; ^ user.cpp:23:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] p = pos[b[i]][cnt[p][b[i]] + coef]; ^ user.cpp: In function ‘int main()’: user.cpp:34:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin >> a + 1; ~~^~~ user.cpp:37:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a[i]]++; ^ user.cpp:41:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[a[i]][fr[a[i]]] = i; ^ user.cpp:41:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[a[i]][fr[a[i]]] = i; ^ user.cpp:45:18: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin >> b + 1; ~~^~~