View Compilation Error

0_0_22552980_7267.cpp: In function 'int main()':
0_0_22552980_7267.cpp:57:2: error: missing template arguments before 'p'
  p;
  ^
0_0_22552980_7267.cpp:66:17: error: 'p' was not declared in this scope
                 p.push_back(P(st - 1, en - 1, va));
                 ^
0_0_22552980_7267.cpp:73:14: error: 'p' was not declared in this scope
         sort(p.begin(), p.end(),cmp);
              ^