Compilare: main.cpp: In function 'int main()': main.cpp:21:13: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | mat[a][b] = mat[b][a] = true; | ^ main.cpp:21:16: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | mat[a][b] = mat[b][a] = true; | ^ main.cpp:21:25: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | mat[a][b] = mat[b][a] = true; | ^ main.cpp:21:28: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | mat[a][b] = mat[b][a] = true; | ^ main.cpp:25:12: warning: array subscript has type 'char' [-Wchar-subscripts] 25 | dp[l][1] = 1; | ^ main.cpp:30:30: warning: array subscript has type 'char' [-Wchar-subscripts] 30 | if (!mat[l1][l2]) { | ^~ main.cpp:31:37: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | dp[l1][i] += dp[l2][i - 1]; | ^~ main.cpp:40:25: warning: array subscript has type 'char' [-Wchar-subscripts] 40 | sol = (sol + dp[l][n]) % MOD; | ^