int robotSim(vector<int>& commands, vector<vector<int>>& obstacles) {int N = commands.size();int M = obstacles.size();//向上 Wx=0,Wy=1//向左 Wx=-1,Wy=0//向下 Wx=0,Wy=-1//向右 Wx=1,Wy=0set<pair<int, int>> st;for (auto &obs : obstacles){st.insert(make_pair(obs[0], obs[1]));}int Wx = 0;int Wy = 1;int Px = 0;int Py = 0;int maxdistance = 0;for (int i = 0; i < N; i++){int cmd = commands[i];//当前指令        if (cmd == -2)//左转
        {if (Wx == 0 && Wy == 1)//上-->左
            {Wx = -1;Wy = 0;}else if (Wx == -1 && Wy == 0)//左-->下
            {Wx = 0;Wy = -1;}else if (Wx == 0 && Wy == -1)//下-->右
            {Wx = 1;Wy = 0;}else if (Wx == 1 && Wy == 0)//右-->上
            {Wx = 0;Wy = 1;}}else if (cmd == -1)//右转
        {if (Wx == 0 && Wy == 1)//上-->右
            {Wx = 1;Wy = 0;}else if (Wx == -1 && Wy == 0)//左-->上
            {Wx = 0;Wy = 1;}else if (Wx == 0 && Wy == -1)//下-->左
            {Wx = -1;Wy = 0;}else if (Wx == 1 && Wy == 0)//右-->下
            {Wx = 0;Wy = -1;}}else//移动 1<=x<=9
        {//此次移动之前的起点位置为Px和Pyint Tmpx = Px;int Tmpy = Py;while (cmd > 0){//以(Wx,Wy)为步进，移动一次Tmpx += Wx;Tmpy += Wy;if (st.find(make_pair(Tmpx, Tmpy)) != st.end()){Tmpx -= Wx;Tmpy -= Wy;cmd = 0;}cmd--;}int distance = Tmpx*Tmpx + Tmpy*Tmpy;if (maxdistance < distance){maxdistance = distance;}Px = Tmpx;Py = Tmpy;}}return maxdistance;
}