Compilare: main.cpp: In function 'int main()': main.cpp:20:16: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | fr[s[ul]]++; | ~~~~^ main.cpp:21:20: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | if (fr[s[ul]] == 1) | ~~~~^ main.cpp:31:20: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | fr[s[pr]]--; | ~~~~^ main.cpp:32:24: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | if (fr[s[pr]] == 0)cnt--; | ~~~~^ main.cpp:13:29: warning: 'b' may be used uninitialized [-Wmaybe-uninitialized] 13 | int pr, ul, cnt, lg, a, b; | ^ main.cpp:13:26: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized] 13 | int pr, ul, cnt, lg, a, b; | ^