View Compilation Error

0_0_25990222_30947.cpp: In function 'int build(int, int, int)':
0_0_25990222_30947.cpp:21:17: error: 'P' was not declared in this scope
     nth_element(P + l, P + m, P + 1 + r, cmp);
                 ^
0_0_25990222_30947.cpp: In function 'void query(int, int, LL, LL)':
0_0_25990222_30947.cpp:32:24: error: 'P' was not declared in this scope
     LL temp = dist(x - P[rt].xy[0], y - P[rt].xy[1]);
                        ^