Compilare: main.cpp: In function 'int main()': main.cpp:20:21: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | while (!lit[ch].empty() && i - lit[ch].front() > k) | ^~ main.cpp:20:44: warning: array subscript has type 'char' [-Wchar-subscripts] 20 | while (!lit[ch].empty() && i - lit[ch].front() > k) | ^~ main.cpp:22:17: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | lit[ch].pop_front(); | ^~ main.cpp:24:18: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | if (!lit[ch].empty()) | ^~ main.cpp:25:28: warning: array subscript has type 'char' [-Wchar-subscripts] 25 | dp[i] = dp[lit[ch].front()] + 1; | ^~ main.cpp:29:21: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | while (!lit[ch].empty() && dp[i] > dp[lit[ch].back()]) | ^~ main.cpp:29:51: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | while (!lit[ch].empty() && dp[i] > dp[lit[ch].back()]) | ^~ main.cpp:31:17: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | lit[ch].pop_back(); | ^~ main.cpp:35:13: warning: array subscript has type 'char' [-Wchar-subscripts] 35 | lit[ch].push_back(i); | ^~ main.cpp:12:25: warning: unused variable 'j' [-Wunused-variable] 12 | int n, k, maxx = 0, j, i; | ^