View Compilation Error

0_0_30271330_4255.cpp:39:1: error: 'PII' does not name a type
 PII euclidean(PII a, PII b) {
 ^
0_0_30271330_4255.cpp: In function 'void Main()':
0_0_30271330_4255.cpp:61:47: error: 'euclidean' was not declared in this scope
     long long b = euclidean({p, x}, {p, x - 1}).first;
                                               ^