View Compilation Error

0_0_23359028_20958.cpp:5:9: error: 'pairPI' does not name a type
 typedef pairPI;
         ^
0_0_23359028_20958.cpp:20:1: error: expected ';' after struct definition
 }
 ^
0_0_23359028_20958.cpp:21:1: error: expected declaration before '}' token
 }
 ^