foo.cc:9:27: error: expected initializer before ':' token
 typedef pair<int, int> PII:
                           ^
foo.cc:13:1: error: 'PII' does not name a type
 PII person[N];
 ^~~
foo.cc: In function 'int main()':
foo.cc:27:3: error: 'person' was not declared in this scope
   person[i] = { t, i };
   ^~~~~~
foo.cc:27:3: note: suggested alternative: 'perror'
   person[i] = { t, i };
   ^~~~~~
   perror
foo.cc:30:7: error: 'person' was not declared in this scope
  sort(person + 1, person + n + 1);
       ^~~~~~
foo.cc:30:7: note: suggested alternative: 'perror'
  sort(person + 1, person + n + 1);
       ^~~~~~
       perror

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