View Compilation Error

0_0_36987211_11728.cpp:107:1: error: 'PII' does not name a type
 PII a[N];
 ^
0_0_36987211_11728.cpp: In function 'bool judge1()':
0_0_36987211_11728.cpp:114:21: error: 'a' was not declared in this scope
         while (nowk<a[i].fi){
                     ^
0_0_36987211_11728.cpp: In function 'bool judge()':
0_0_36987211_11728.cpp:128:19: error: 'a' was not declared in this scope
     while (nowk < a[i].fi){
                   ^
0_0_36987211_11728.cpp:133:7: error: 'a' was not declared in this scope
     b[a[i].se]=1;
       ^
0_0_36987211_11728.cpp: In function 'int main()':
0_0_36987211_11728.cpp:147:28: error: 'a' was not declared in this scope
             scanf("%lld", &a[i].fi);
                            ^
0_0_36987211_11728.cpp:151:14: error: 'a' was not declared in this scope
         sort(a+1, a+n+1);
              ^