Compilare: user.cpp: In function ‘int main()’: user.cpp:22:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (len == 1) dp[i][i+1] = s[c[i]][c[i+1]]; ^ user.cpp:22:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (len == 1) dp[i][i+1] = s[c[i]][c[i+1]]; ^ user.cpp:27:91: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+len] = min(dp[i][i+len],dp[i+1][j-1] + dp[j+1][i+len] + s[c[i]][c[j]]); ^ user.cpp:27:97: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+len] = min(dp[i][i+len],dp[i+1][j-1] + dp[j+1][i+len] + s[c[i]][c[j]]); ^