View Compilation Error

0_0_21894630_25346.cpp: In function 'long long int treeQuery(int, int, int)':
0_0_21894630_25346.cpp:169:18: error: 'p1' was not declared in this scope
             swap(p1, p2);
                  ^
0_0_21894630_25346.cpp:169:22: error: 'p2' was not declared in this scope
             swap(p1, p2);
                      ^
0_0_21894630_25346.cpp:173:19: error: 'p1' was not declared in this scope
         x = fater[p1];
                   ^