Compilare: main.cpp: In function 'void read()': main.cpp:39:17: warning: array subscript has type 'char' [-Wchar-subscripts] 39 | invalid[a][b] = 1; | ^ main.cpp:39:20: warning: array subscript has type 'char' [-Wchar-subscripts] 39 | invalid[a][b] = 1; | ^ main.cpp:40:17: warning: array subscript has type 'char' [-Wchar-subscripts] 40 | invalid[b][a] = 1; | ^ main.cpp:40:20: warning: array subscript has type 'char' [-Wchar-subscripts] 40 | invalid[b][a] = 1; | ^ main.cpp: In function 'void solve()': main.cpp:48:25: warning: array subscript has type 'char' [-Wchar-subscripts] 48 | if(!invalid[i][j]) | ^ main.cpp:48:28: warning: array subscript has type 'char' [-Wchar-subscripts] 48 | if(!invalid[i][j]) | ^ main.cpp:49:23: warning: array subscript has type 'char' [-Wchar-subscripts] 49 | match[i].push_back(j); | ^ main.cpp:52:15: warning: array subscript has type 'char' [-Wchar-subscripts] 52 | dp[1][i] = 1; | ^ main.cpp:56:33: warning: array subscript has type 'char' [-Wchar-subscripts] 56 | for(auto ch : match[j]) | ^ main.cpp:57:23: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | dp[i][j] = (dp[i][j] + dp[i - 1][ch]) % mod; | ^ main.cpp:57:35: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | dp[i][j] = (dp[i][j] + dp[i - 1][ch]) % mod; | ^ main.cpp:57:50: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | dp[i][j] = (dp[i][j] + dp[i - 1][ch]) % mod; | ^~ main.cpp:61:28: warning: array subscript has type 'char' [-Wchar-subscripts] 61 | sol = (sol + dp[n][i]) % mod; | ^