Compilare: main.cpp: In function 'bool check(int)': main.cpp:16:27: warning: array subscript has type 'char' [-Wchar-subscripts] if (frUntil[n][let] - frUntil[last][let] < x) { ^ main.cpp:16:48: warning: array subscript has type 'char' [-Wchar-subscripts] if (frUntil[n][let] - frUntil[last][let] < x) { ^ main.cpp:19:41: warning: array subscript has type 'char' [-Wchar-subscripts] last = pos[x + frUntil[last][let]][let]; ^ main.cpp:19:47: warning: array subscript has type 'char' [-Wchar-subscripts] last = pos[x + frUntil[last][let]][let]; ^ main.cpp: In function 'int main()': main.cpp:29:24: warning: array subscript has type 'char' [-Wchar-subscripts] frUntil[i][s[i]]++; ^ main.cpp:30:28: warning: array subscript has type 'char' [-Wchar-subscripts] pos[frUntil[i][s[i]]][s[i]] = i; ^ main.cpp:30:35: warning: array subscript has type 'char' [-Wchar-subscripts] pos[frUntil[i][s[i]]][s[i]] = i; ^ main.cpp:37:38: warning: array subscript has type 'char' [-Wchar-subscripts] r = min(r, frUntil[n][let]); ^ main.cpp:48:24: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << ans << '\n'; ^~~~