Compilare: user.cpp: In function ‘int d(int, int)’: user.cpp:12:13: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (x&1 == y&1) return inf; ^ user.cpp: In function ‘int main()’: user.cpp:28:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (len == 1) dp[i][i+1] = s[c[i]][c[i+1]]; ^ user.cpp:28:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (len == 1) dp[i][i+1] = s[c[i]][c[i+1]]; ^ user.cpp:33:87: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+len] = min(dp[i][i+len],d(i+1,j-1) + d(j+1,i+len) + s[c[i]][c[j]]); ^ user.cpp:33:93: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+len] = min(dp[i][i+len],d(i+1,j-1) + d(j+1,i+len) + s[c[i]][c[j]]); ^