for iinrange(n-1,-1,-1):

dp_buy=max(dp1_sell- prices[i], dp1_buy)

dp_sell=max(dp2_buy+ prices[i], dp1_sell)

dp2_buy, dp1_sell= dp1_buy, dp1_sell

dp2_buy= dp1_buy

dp1_buy, dp1_sell= dp_buy, dp_sell

return dp1_buy

int dp_buy=Math.max(dp1_sell- prices[i], dp1_buy);

int dp_sell=Math.max(dp2_buy+ prices[i], dp1_sell);

dp2_buy= dp1_buy;

dp1_sell= dp1_sell;

dp1_buy= dp_buy;

dp1_sell= dp_sell;

}

let dp_buy=Math.max(dp1_sell- prices[i], dp1_buy);

let dp_sell=Math.max(dp2_buy+ prices[i], dp1_sell);

dp2_buy= dp1_buy;

dp1_sell= dp1_sell;

dp1_buy= dp_buy;

dp1_sell= dp_sell;

}

intdp_buy=Math.Max(dp1_sell-prices[i],dp1_buy);

intdp_sell=Math.Max(dp2_buy+prices[i],dp1_sell);

dp2_buy=dp1_buy;

dp1_sell=dp1_sell;

dp1_buy=dp_buy;

dp1_sell=dp_sell;

}