View Compilation Error

0_0_27550192_21233.cpp: In function 'int main()':
0_0_27550192_21233.cpp:30:13: error: 'll' was not declared in this scope
             ll x = a[temp + 1];
             ^
0_0_27550192_21233.cpp:31:16: error: expected ';' before 'y'
             ll y = x * temp - dp[temp];
                ^
0_0_27550192_21233.cpp:32:29: error: 'y' was not declared in this scope
             while (tail && (y - Y(tail)) * (x - X(tail - 1)) < (y - Y(tail - 1)) * (x - X(tail))) --tail;
                             ^
0_0_27550192_21233.cpp:32:45: error: 'x' was not declared in this scope
             while (tail && (y - Y(tail)) * (x - X(tail - 1)) < (y - Y(tail - 1)) * (x - X(tail))) --tail;
                                             ^