View Compilation Error

0_0_36316781_491.cpp: In function 'void sol()':
0_0_36316781_491.cpp:32:36: error: 'max' was not declared in this scope
      res = max(res, mx[p[x][w ^ 1]]);
                                    ^
0_0_36316781_491.cpp:40:29: error: 'max' was not declared in this scope
   if (x)res = max(res, mx[x]);
                             ^
0_0_36316781_491.cpp:50:24: error: 'max' was not declared in this scope
    mx[x] = max(mx[x], i);
                        ^